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<h3>
Marge Bot pushed to branch wip/marge_bot_batch_merge_job
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a0f8243efc9873a949bb6f082b4dfdf563fc1ea">1a0f8243</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-21T16:45:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused ThBrackCtxt and ResSigCtxt
Fixes #18715.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f222b120e48df1b3d78f5501612d21c2a2dc470">2f222b12</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-21T16:45:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disallow constraints in KindSigCtxt
This patch cleans up how `GHC.Tc.Validity` classifies `UserTypeCtxt`s
that can only refer to kind-level positions, which is important for
rejecting certain classes of programs. In particular, this patch:
* Introduces a new `TypeOrKindCtxt` data type and
`typeOrKindCtxt :: UserTypeCtxt -> TypeOrKindCtxt` function, which
determines whether a `UserTypeCtxt` can refer to type-level
contexts, kind-level contexts, or both.
* Defines the existing `allConstraintsAllowed` and `vdqAllowed`
functions in terms of `typeOrKindCtxt`, which avoids code
duplication and ensures that they stay in sync in the future.
The net effect of this patch is that it fixes #18714, in which it was
discovered that `allConstraintsAllowed` incorrectly returned `True`
for `KindSigCtxt`. Because `typeOrKindCtxt` now correctly classifies
`KindSigCtxt` as a kind-level context, this bug no longer occurs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aaa51dcfdb729f130aeefeaeac15029b62096a74">aaa51dcf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-21T16:46:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add extra-deps: happy-1.20 to stack.yaml
GHC now requires happy-1.20, which isn't available in LTS-16.14.
Fixes #18726.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8a032e44e75f02679c9b9d6cd181c9e01a96a42e">8a032e44</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-21T17:17:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the occurrence analyser
Ticket #18603 demonstrated that the occurrence analyser's
handling of
local RULES for imported Ids
(which I now call IMP-RULES) was inadequate. It led the simplifier
into an infnite loop by failing to label a binder as a loop breaker.
The main change in this commit is to treat IMP-RULES in a simple and
uniform way: as extra rules for the local binder. See
Note [IMP-RULES: local rules for imported functions]
This led to quite a bit of refactoring. The result is still tricky,
but it's much better than before, and better documented I think.
Oh, and it fixes the bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/411d1425c41102b504c8af551226e7ba7fdb20c3">411d1425</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-21T17:17:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck - Comments only: Replace /~ by ≁
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0cc0c034e0b6f47844f62450f80aca9280e2c25f">0cc0c034</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-21T17:17:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Rewrite inhabitation test
We used to produce inhabitants of a pattern-match refinement type Nabla
in the checker in at least two different and mostly redundant ways:
1. There was `provideEvidence` (now called
`generateInhabitingPatterns`) which is used by
`GHC.HsToCore.PmCheck` to produce non-exhaustive patterns, which
produces inhabitants of a Nabla as a sub-refinement type where all
match variables are instantiated.
2. There also was `ensure{,All}Inhabited` (now called
`inhabitationTest`) which worked slightly different, but was
whenever new type constraints or negative term constraints were
added. See below why `provideEvidence` and `ensureAllInhabited`
can't be the same function, the main reason being performance.
3. And last but not least there was the `nonVoid` test, which tested
that a given type was inhabited. We did use this for strict fields
and -XEmptyCase in the past.
The overlap of (3) with (2) was always a major pet peeve of mine. The
latter was quite efficient and proven to work for recursive data types,
etc, but could not handle negative constraints well (e.g. we often want
to know if a *refined* type is empty, such as `{ x:[a] | x /= [] }`).
Lower Your Guards suggested that we could get by with just one, by
replacing both functions with `inhabitationTest` in this patch.
That was only possible by implementing the structure of φ constraints
as in the paper, namely the semantics of φ constructor constraints.
This has a number of benefits:
a. Proper handling of unlifted types and strict fields, fixing #18249,
without any code duplication between
`GHC.HsToCore.PmCheck.Oracle.instCon` (was `mkOneConFull`) and
`GHC.HsToCore.PmCheck.checkGrd`.
b. `instCon` can perform the `nonVoid` test (3) simply by emitting
unliftedness constraints for strict fields.
c. `nonVoid` (3) is thus simply expressed by a call to
`inhabitationTest`.
d. Similarly, `ensureAllInhabited` (2), which we called after adding
type info, now can similarly be expressed as the fuel-based
`inhabitationTest`.
See the new `Note [Why inhabitationTest doesn't call generateInhabitingPatterns]`
why we still have tests (1) and (2).
Fixes #18249 and brings nice metric decreases for `T17836` (-76%) and
`T17836b` (-46%), as well as `T18478` (-8%) at the cost of a few very
minor regressions (< +2%), potentially due to the fact that
`generateInhabitingPatterns` does more work to suggest the minimal
COMPLETE set.
Metric Decrease:
T17836
T17836b
</pre>
</li>
</ul>
<h4>22 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#448d7f6e0151c2014de38dead3a902f511c45b75">
compiler/GHC/Core/FVs.hs
</a>
</li>
<li class="file-stats">
<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347">
compiler/GHC/Core/Opt/OccurAnal.hs
</a>
</li>
<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#ac0a6473a902628a18b3a470122e5cc1ce09de14">
compiler/GHC/HsToCore/PmCheck.hs
</a>
</li>
<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
</a>
</li>
<li class="file-stats">
<a href="#16160f179df308e914fffee87ce52c9a048bde89">
compiler/GHC/HsToCore/PmCheck/Ppr.hs
</a>
</li>
<li class="file-stats">
<a href="#a90b29966ba2a86c0f6927651648cb062f00ea03">
compiler/GHC/HsToCore/PmCheck/Types.hs
</a>
</li>
<li class="file-stats">
<a href="#c69516c9e3cf2716177602126901a5efa3e92675">
<span class="deleted-file">
−
compiler/GHC/HsToCore/PmCheck/Types.hs-boot
</span>
</a>
</li>
<li class="file-stats">
<a href="#b2fd0f5f3e0bc9dcc507931c0b7388bf10e925c2">
compiler/GHC/HsToCore/Types.hs
</a>
</li>
<li class="file-stats">
<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
</a>
</li>
<li class="file-stats">
<a href="#93bba9b9e0195db135fec54160523a427ea042fd">
compiler/GHC/Tc/Types/Origin.hs
</a>
</li>
<li class="file-stats">
<a href="#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd">
compiler/GHC/Tc/Validity.hs
</a>
</li>
<li class="file-stats">
<a href="#15573cb40fce6bde985c520c7e7647ab4c13453e">
hadrian/stack.yaml
</a>
</li>
<li class="file-stats">
<a href="#9de9b4ec5912bd8bfa5c7fdf03a23a09bb21ef46">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18249.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#307f80581cbcfe76d629bd3d5d781205678b0fc3">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18249.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
</a>
</li>
<li class="file-stats">
<a href="#d1d7de5bc3d2b577ac871114201f27e9ccc2f689">
<span class="new-file">
+
testsuite/tests/simplCore/should_compile/T18603.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
</a>
</li>
<li class="file-stats">
<a href="#405f5d1cb617045179d54d273156397003f57608">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T18714.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#8076d93aadc99b99c0bea670f65e09a979e1ce61">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T18714.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="448d7f6e0151c2014de38dead3a902f511c45b75">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#448d7f6e0151c2014de38dead3a902f511c45b75"><strong>compiler/GHC/Core/FVs.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="10" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -10,16 +10,12 @@ Taken quite directly from the Peyton Jones/Lester paper.</td>
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="cd">-- | A module concerned with finding the free variables of an expression.</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="11" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="11" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span> <span class="p">(</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="12" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="12" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Free variables of expressions and binding groups</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="13" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVars</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="14" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVars</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">exprsFreeVars</span></span><span class="p"><span class="idiff right">,</span></span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="14" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVarsDSet</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="15" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVarsList</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="16" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIds</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsDSet</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsList</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="19" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsDSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeVars</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeVarsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeVarsList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeVarsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIds</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsDSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsDSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">exprFreeIdsList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">exprsFreeIdsList</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">bindFreeVars</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Selective free variables of expressions</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -127,6 +123,9 @@ exprFreeVarsList = fvVarList . exprFVs</td>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"><span class="n" style="color: #333;">exprFreeIds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Find all locally-defined free Ids</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"><span class="n" style="color: #333;">exprFreeIds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprSomeFreeVars</span> <span class="n" style="color: #333;">isLocalId</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"><span class="n" style="color: #333;">exprsFreeIds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Find all locally-defined free Ids</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"><span class="n" style="color: #333;">exprsFreeIds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprsSomeFreeVars</span> <span class="n" style="color: #333;">isLocalId</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="cd">-- | Find all locally-defined free Ids in an expression</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning a deterministic set.</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">exprFreeIdsDSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DIdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Find all locally-defined free Ids</span></span>
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<li id="bac3d5159a5688007de3aa3f5c4e50569677b347">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#bac3d5159a5688007de3aa3f5c4e50569677b347"><strong>compiler/GHC/Core/Opt/OccurAnal.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -61,10 +61,15 @@ import Data.List</td>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here's the externally-callable interface:</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do occurrence analysis, and discard occurrence info returned</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">occAnal</span> <span class="n" style="color: #333;">initOccEnv</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalysePgm</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span> <span class="c1" style="color: #998; font-style: italic;">-- Used only in debug output</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Active unfoldings</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Active rules</span></span>
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<pre style="margin: 0;">-<span id="LC67" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">]</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Local rules for imported Ids</span></span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreProgram</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreProgram</span></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalysePgm</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">active_unf</span> <span class="n" style="color: #333;">active_rule</span> <span class="n" style="color: #333;">imp_rules</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyDetails</span> <span class="n" style="color: #333;">final_usage</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -95,15 +100,21 @@ occurAnalysePgm this_mod active_unf active_rule imp_rules binds</td>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"> <span class="n" style="color: #333;">initial_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addManyOccs</span> <span class="n" style="color: #333;">emptyDetails</span> <span class="p">(</span><span class="n" style="color: #333;">rulesFreeVars</span> <span class="n" style="color: #333;">imp_rules</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The RULES declarations keep things alive!</span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">plusVarEnv_C</span> <span class="n" style="color: #333;">unionVarSet</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">mapVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="n" style="color: #333;">maps_to</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"> <span class="n" style="color: #333;">getUniqSet</span> <span class="p">(</span><span class="n" style="color: #333;">exprFreeIds</span> <span class="n" style="color: #333;">arg</span> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="n" style="color: #333;">imp_rule</span><span class="p">)</span></span>
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102
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">imp_rule</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">imp_rules</span></span>
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103
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isBuiltinRule</span> <span class="n" style="color: #333;">imp_rule</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Plugin rules]</span></span>
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104
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">maps_to</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprFreeIds</span> <span class="p">(</span><span class="n" style="color: #333;">ru_rhs</span> <span class="n" style="color: #333;">imp_rule</span><span class="p">)</span></span>
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105
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="n" style="color: #333;">imp_rule</span></span>
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106
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ru_args</span> <span class="n" style="color: #333;">imp_rule</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- imp_rule_edges maps a top-level local binder 'f' to the</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RHS free vars of any IMP-RULE, a local RULE for an imported function,</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where 'f' appears on the LHS</span></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. RULE foldr f = blah</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- imp_rule_edges contains f :-> fvs(blah)</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We treat such RULES as extra rules for 'f'</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">plusVarEnv_C</span> <span class="p">(</span><span class="o" style="font-weight: 600;">++</span><span class="p">))</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">mapVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="p">[(</span><span class="n" style="color: #333;">act</span><span class="p">,</span><span class="n" style="color: #333;">rhs_fvs</span><span class="p">)])</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getUniqSet</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">exprsFreeIds</span> <span class="n" style="color: #333;">args</span> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Rule</span> <span class="p">{</span> <span class="n" style="color: #333;">ru_act</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">act</span><span class="p">,</span> <span class="n" style="color: #333;">ru_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ru_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">ru_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">imp_rules</span></span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Not BuiltinRules; see Note [Plugin rules]</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprFreeIds</span> <span class="n" style="color: #333;">rhs</span> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -115,297 +126,64 @@ occurAnalysePgm this_mod active_unf active_rule imp_rules binds</td>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_usage</span><span class="p">,</span> <span class="n" style="color: #333;">bind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalBind</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevel</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bind</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"> <span class="n" style="color: #333;">bs_usage</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span></span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do occurrence analysis, and discard occurrence info returned</span></span>
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"><span class="n" style="color: #333;">occurAnalyseExpr</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">occAnal</span> <span class="n" style="color: #333;">initOccEnv</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Plugin rules]</span></span>
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Conal Elliott (#11651) built a GHC plugin that added some</span></span>
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRules (for imported Ids) to the mg_rules field of ModGuts, to</span></span>
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">do some domain-specific transformations that could not be expressed</span></span>
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with an ordinary pattern-matching CoreRule. But then we can't extract</span></span>
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129
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<pre style="margin: 0;">-<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the dependencies (in imp_rule_edges) from ru_rhs etc, because a</span></span>
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130
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<pre style="margin: 0;">-<span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRule doesn't have any of that stuff.</span></span>
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131
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<pre style="margin: 0;">-<span id="LC131" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we simply assume that BuiltinRules have no dependencies, and filter</span></span>
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133
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them out from the imp_rule_edges comprehension.</span></span>
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Bindings</span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> IMP-RULES</span></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Local rules for imported functions</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recursive bindings: the grand plan]</span></span>
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144
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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we come across a binding group</span></span>
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146
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { x1 = r1; ...; xn = rn }</span></span>
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147
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we treat it like this (occAnalRecBind):</span></span>
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148
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"></span>
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149
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Occurrence-analyse each right hand side, and build a</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> "Details" for each binding to capture the results.</span></span>
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151
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"></span>
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152
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Wrap the details in a Node (details, node-id, dep-node-ids),</span></span>
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153
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where node-id is just the unique of the binder, and</span></span>
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154
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dep-node-ids lists all binders on which this binding depends.</span></span>
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155
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We'll call these the "scope edges".</span></span>
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Forming the Rec groups].</span></span>
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157
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"></span>
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158
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> All this is done by makeNode.</span></span>
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159
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Do SCC-analysis on these Nodes. Each SCC will become a new Rec or</span></span>
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161
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NonRec. The key property is that every free variable of a binding</span></span>
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162
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is accounted for by the scope edges, so that when we are done</span></span>
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163
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> everything is still in scope.</span></span>
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164
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"></span>
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165
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. For each Cyclic SCC of the scope-edge SCC-analysis in (2), we</span></span>
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166
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> identify suitable loop-breakers to ensure that inlining terminates.</span></span>
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167
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is done by occAnalRec.</span></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4. To do so we form a new set of Nodes, with the same details, but</span></span>
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170
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different edges, the "loop-breaker nodes". The loop-breaker nodes</span></span>
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171
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have both more and fewer dependencies than the scope edges</span></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Choosing loop breakers])</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More edges: if f calls g, and g has an active rule that mentions h</span></span>
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175
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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then we add an edge from f -> h</span></span>
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176
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Fewer edges: we only include dependencies on active rules, on rule</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RHSs (not LHSs) and if there is an INLINE pragma only</span></span>
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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> on the stable unfolding (and vice versa). The scope</span></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> edges must be much more inclusive.</span></span>
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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">5. The "weak fvs" of a node are, by definition:</span></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the scope fvs - the loop-breaker fvs</span></span>
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Weak loop breakers], and the nd_weak field of Details</span></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">6. Having formed the loop-breaker nodes</span></span>
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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"></span>
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188
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Dead code]</span></span>
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189
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~</span></span>
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190
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Dropping dead code for a cyclic Strongly Connected Component is done</span></span>
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191
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a very simple way:</span></span>
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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the entire SCC is dropped if none of its binders are mentioned</span></span>
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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the body; otherwise the whole thing is kept.</span></span>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"></span>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key observation is that dead code elimination happens after</span></span>
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197
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency analysis: so 'occAnalBind' processes SCCs instead of the</span></span>
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198
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">original term's binding groups.</span></span>
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199
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"></span>
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200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thus 'occAnalBind' does indeed drop 'f' in an example like</span></span>
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201
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"></span>
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202
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> letrec f = ...g...</span></span>
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203
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = ...(...g...)...</span></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in</span></span>
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205
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...g...</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when 'g' no longer uses 'f' at all (eg 'f' does not occur in a RULE in</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'g'). 'occAnalBind' first consumes 'CyclicSCC g' and then it consumes</span></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'AcyclicSCC f', where 'body_usage' won't contain 'f'.</span></span>
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Forming Rec groups]</span></span>
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We put bindings {f = ef; g = eg } in a Rec group if "f uses g"</span></span>
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and "g uses f", no matter how indirectly. We do a SCC analysis</span></span>
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with an edge f -> g if "f uses g".</span></span>
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">More precisely, "f uses g" iff g should be in scope wherever f is.</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That is, g is free in:</span></span>
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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) the rhs 'ef'</span></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) or the RHS of a rule for f (Note [Rules are extra RHSs])</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> c) or the LHS or a rule for f (Note [Rule dependency info])</span></span>
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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">These conditions apply regardless of the activation of the RULE (eg it might be</span></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inactive in this phase but become active later). Once a Rec is broken up</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it can never be put back together, so we must be conservative.</span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The principle is that, regardless of rule firings, every variable is</span></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">always in scope.</span></span>
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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are extra RHSs]</span></span>
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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A RULE for 'f' is like an extra RHS for 'f'. That way the "parent"</span></span>
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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> keeps the specialised "children" alive. If the parent dies</span></span>
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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (because it isn't referenced any more), then the children will die</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> too (unless they are already referenced directly).</span></span>
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> To that end, we build a Rec group for each cyclic strongly</span></span>
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> connected component,</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *treating f's rules as extra RHSs for 'f'*.</span></span>
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More concretely, the SCC analysis runs on a graph with an edge</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from f -> g iff g is mentioned in</span></span>
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) f's rhs</span></span>
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) f's RULES</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> These are rec_edges.</span></span>
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Under (b) we include variables free in *either* LHS *or* RHS of</span></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the rule. The former might seems silly, but see Note [Rule</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependency info]. So in Example [eftInt], eftInt and eftIntFB</span></span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> will be put in the same Rec, even though their 'main' RHSs are</span></span>
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> both non-recursive.</span></span>
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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rule dependency info]</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The VarSet in a RuleInfo is used for dependency analysis in the</span></span>
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrence analyser. We must track free vars in *both* lhs and rhs.</span></span>
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Hence use of idRuleVars, rather than idRuleRhsVars in occAnalBind.</span></span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Why both? Consider</span></span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = y</span></span>
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f x = v+4</span></span>
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then if we substitute y for x, we'd better do so in the</span></span>
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule's LHS too, so we'd better ensure the RULE appears to mention 'x'</span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as well as 'v'</span></span>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are visible in their own rec group]</span></span>
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<pre style="margin: 0;">-<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We want the rules for 'f' to be visible in f's right-hand side.</span></span>
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<pre style="margin: 0;">-<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> And we'd like them to be visible in other functions in f's Rec</span></span>
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<pre style="margin: 0;">-<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> group. E.g. in Note [Specialisation rules] we want f' rule</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to be visible in both f's RHS, and fs's RHS.</span></span>
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This means that we must simplify the RULEs first, before looking</span></span>
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<pre style="margin: 0;">-<span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> at any of the definitions. This is done by Simplify.simplRecBind,</span></span>
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<pre style="margin: 0;">-<span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when it calls addLetIdInfo.</span></span>
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<pre style="margin: 0;">-<span id="LC275" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Choosing loop breakers]</span></span>
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<pre style="margin: 0;">-<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Loop breaking is surprisingly subtle. First read the section 4 of</span></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"Secrets of the GHC inliner". This describes our basic plan.</span></span>
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We avoid infinite inlinings by choosing loop breakers, and</span></span>
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensuring that a loop breaker cuts each loop.</span></span>
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<pre style="margin: 0;">-<span id="LC283" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Inlining and hs-boot files] in GHC.Core.ToIface, which</span></span>
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deals with a closely related source of infinite loops.</span></span>
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fundamentally, we do SCC analysis on a graph. For each recursive</span></span>
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group we choose a loop breaker, delete all edges to that node,</span></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">re-analyse the SCC, and iterate.</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But what is the graph? NOT the same graph as was used for Note</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Forming Rec groups]! In particular, a RULE is like an equation for</span></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'f' that is *always* inlined if it is applicable. We do *not* disable</span></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rules for loop-breakers. It's up to whoever makes the rules to make</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sure that the rules themselves always terminate. See Note [Rules for</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">recursive functions] in GHC.Core.Opt.Simplify</span></span>
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence, if</span></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f's RHS (or its INLINE template if it has one) mentions g, and</span></span>
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g has a RULE that mentions h, and</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h has a RULE that mentions f</span></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we *must* choose f to be a loop breaker. Example: see Note</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Specialisation rules].</span></span>
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In general, take the free variables of f's RHS, and augment it with</span></span>
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<pre style="margin: 0;">-<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all the variables reachable by RULES from those starting points. That</span></span>
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is the whole reason for computing rule_fv_env in occAnalBind. (Of</span></span>
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">course we only consider free vars that are also binders in this Rec</span></span>
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group.) See also Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that when we compute this rule_fv_env, we only consider variables</span></span>
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<pre style="margin: 0;">-<span id="LC313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">free in the *RHS* of the rule, in contrast to the way we build the</span></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Rec group in the first place (Note [Rule dependency info])</span></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that if 'g' has RHS that mentions 'w', we should add w to</span></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">g's loop-breaker edges. More concretely there is an edge from f -> g</span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">iff</span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) g is mentioned in f's RHS `xor` f's INLINE rhs</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Inline rules])</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) or h is mentioned in f's RHS, and</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g appears in the RHS of an active RULE of h</span></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or a transitive sequence of active rules starting with h</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why "active rules"? See Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that in Example [eftInt], *neither* eftInt *nor* eftIntFB is</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">chosen as a loop breaker, because their RHSs don't mention each other.</span></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And indeed both can be inlined safely.</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note again that the edges of the graph we use for computing loop breakers</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are not the same as the edges we use for computing the Rec blocks.</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's why we compute</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- rec_edges for the Rec block analysis</span></span>
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<pre style="margin: 0;">-<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- loop_breaker_nodes for the loop breaker analysis</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Finding rule RHS free vars]</span></span>
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<pre style="margin: 0;">-<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider this real example from Data Parallel Haskell</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero :: Array Int -> Array Tag</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# INLINE [1] tagZeroes #-}</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero xs = pmap (\x -> fromBool (x==0)) xs</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "tagZero" [~1] forall xs n.</span></span>
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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pmap fromBool <blah blah> = tagZero xs #-}</span></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So tagZero's RHS mentions pmap, and pmap's RULE mentions tagZero.</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, tagZero can only be inlined in phase 1 and later, while</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the RULE is only active *before* phase 1. So there's no problem.</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IdEnv</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Mapping from a local Id 'f' to info about its IMP-RULES,</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- i.e. /local/ rules for an imported Id that mention 'f' on the LHS</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We record (a) its Activation and (b) the RHS free vars</span></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [IMP-RULES: local rules for imported functions]</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> To make this work, we look for the RHS free vars only for</span></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *active* rules. That's the reason for the occ_rule_act field</span></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the OccEnv.</span></span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Weak loop breakers]</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is a last nasty wrinkle. Suppose we have</span></span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = f_rhs</span></span>
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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = h_rhs</span></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = h</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...more...</span></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Remember that we simplify the RULES before any RHS (see Note</span></span>
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [Rules are visible in their own rec group] above).</span></span>
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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we must *not* postInlineUnconditionally 'g', even though</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> its RHS turns out to be trivial. (I'm assuming that 'g' is</span></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not chosen as a loop breaker.) Why not? Because then we</span></span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> drop the binding for 'g', which leaves it out of scope in the</span></span>
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374
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE!</span></span>
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375
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here's a somewhat different example of the same thing</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { g = h</span></span>
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378
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ...f...</span></span>
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379
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; f = f_rhs</span></span>
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<pre style="margin: 0;">-<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g }</span></span>
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381
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here the RULE is "below" g, but we *still* can't postInlineUnconditionally</span></span>
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g, because the RULE for f is active throughout. So the RHS of h</span></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> might rewrite to h = ...g...</span></span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So g must remain in scope in the output program!</span></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We "solve" this by:</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"><span class="n" style="color: #333;">lookupImpRules</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">lookupImpRules</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span> <span class="kr" style="font-weight: 600;">of</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">vs</span></span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Variable mentioned in RHS of an IMP-RULE for the bndr,</span></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- whether active or not</span></span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="n" style="color: #333;">imp_rules_info</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">emptyDetails</span> <span class="n" style="color: #333;">imp_rules_info</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="n" style="color: #333;">add</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">vs</span><span class="p">)</span> <span class="n" style="color: #333;">usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addManyOccs</span> <span class="n" style="color: #333;">usage</span> <span class="n" style="color: #333;">vs</span></span>
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387
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158
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Make g a "weak" loop breaker (OccInfo = IAmLoopBreaker True)</span></span>
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389
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> iff g is a "missing free variable" of the Rec group</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesActiveFvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="n" style="color: #333;">impRulesActiveFvs</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">vs</span></span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">vs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bndr_set</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">add</span> <span class="p">(</span><span class="n" style="color: #333;">act</span><span class="p">,</span><span class="n" style="color: #333;">vs</span><span class="p">)</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">act</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vs</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"></span>
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391
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A "missing free variable" x is one that is mentioned in an RHS or</span></span>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> INLINE or RULE of a binding in the Rec group, but where the</span></span>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependency on x may not show up in the loop_breaker_nodes (see</span></span>
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394
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> note [Choosing loop breakers} above).</span></span>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [IMP-RULES: local rules for imported functions]</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We quite often have</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * A /local/ rule</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * for an /imported/ function</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">like this:</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo x = blah</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULE "map/foo" forall xs. map foo xs = xs #-}</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We call them IMP-RULES. They are important in practice, and occur a</span></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lot in the libraries.</span></span>
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395
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177
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"></span>
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396
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A normal "strong" loop breaker has IAmLoopBreaker False. So</span></span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">IMP-RULES are held in mg_rules of ModGuts, and passed in to</span></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurAnalysePgm.</span></span>
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397
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180
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"></span>
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398
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Inline postInlineUnconditionally</span></span>
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399
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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> strong IAmLoopBreaker False no no</span></span>
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400
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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> weak IAmLoopBreaker True yes no</span></span>
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401
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> other yes yes</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Main Invariant:</span></span>
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402
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182
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"></span>
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403
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The **sole** reason for this kind of loop breaker is so that</span></span>
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404
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> postInlineUnconditionally does not fire. Ugh. (Typically it'll</span></span>
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405
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline via the usual callSiteInline stuff, so it'll be dead in the</span></span>
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406
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next pass, so the main Ugh is the tiresome complication.)</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Throughout, we treat an IMP-RULE that mentions 'f' on its LHS</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> just like a RULE for f.</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">Rules for imported function</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [<span class="idiff left right">IMP-RULES: unavoidable loop</span>s]</span></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = /\a. B.g a</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -428,14 +206,28 @@ B.g. We could only spot such loops by exhaustively following</td>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unfoldings of C.h etc, in case we reach B.g, and hence (via the RULE)</span></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">f.</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that RULES for imported functions are important in practice; they</span></span>
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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occur a lot in the libraries.</span></span>
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We regard this potential infinite loop as a *programmer* error.</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's up the programmer not to write silly rules like</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f x = f x</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and the example above is just a more complicated version.</span></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Specialising imported functions] (referred to from Specialise)</span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For *automatically-generated* rules, the programmer can't be</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">responsible for the "programmer error" in Note [IMP-RULES: unavoidable</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">loops]. In particular, consider specialising a recursive function</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defined in another module. If we specialise a recursive function B.g,</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we get</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g_spec = .....(B.g Int).....</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE B.g Int = g_spec</span></span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, g_spec doesn't look recursive, but when the rule fires, it</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">becomes so. And if B.g was mutually recursive, the loop might not be</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as obvious as it is here.</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To avoid this,</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * When specialising a function that is a loop breaker,</span></span>
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> give a NOINLINE pragma to the specialised function</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider:</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -501,70 +293,207 @@ And we are in an infinite loop again, except that this time the loop is producin</td>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">infinitely large *term* (an unrolling of filter) and so the simplifier finally</span></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dies with "ticks exhausted"</span></span>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because of this problem, we make a small change in the occurrence analyser</span></span>
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505
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">designed to mark functions like "filter" as strong loop breakers on the basis that:</span></span>
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506
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. The RHS of filter mentions the local function "filterFB"</span></span>
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507
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. We have a rule which mentions "filterFB" on the LHS and "filter" on the RHS</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">SOLUTION: we treat the rule "filterList" as an extra rule for 'filterFB'</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because it mentions 'filterFB' on the LHS. This is the Main Invariant</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in Note [IMP-RULES: local rules for imported functions].</span></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So, during loop-breaker analysis:</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- for each active RULE for a local function 'f' we add an edge bewteen</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'f' and the local FVs of the rule RHS</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- for each active RULE for an *imported* function we add dependency</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> edges between the *local* FVS of the rule LHS and the *local* FVS of</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the rule RHS.</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even with this extra hack we aren't always going to get things</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right. For example, it might be that the rule LHS mentions an imported</span></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Id, and another module has a RULE that can rewrite that imported Id to</span></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one of our local Ids.</span></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Plugin rules]</span></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Conal Elliott (#11651) built a GHC plugin that added some</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRules (for imported Ids) to the mg_rules field of ModGuts, to</span></span>
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">do some domain-specific transformations that could not be expressed</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with an ordinary pattern-matching CoreRule. But then we can't extract</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the dependencies (in imp_rule_edges) from ru_rhs etc, because a</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BuiltinRule doesn't have any of that stuff.</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we simply assume that BuiltinRules have no dependencies, and filter</span></span>
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324
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them out from the imp_rule_edges comprehension.</span></span>
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325
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"></span>
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326
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Glomming]</span></span>
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327
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~</span></span>
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328
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RULES for imported Ids can make something at the top refer to</span></span>
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329
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">something at the bottom:</span></span>
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330
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"></span>
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331
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo = ...(B.f @Int)...</span></span>
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332
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $sf = blah</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE: B.f @Int = $sf</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Applying this rule makes foo refer to $sf, although foo doesn't appear to</span></span>
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336
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">depend on $sf. (And, as in Note [Rules for imported functions], the</span></span>
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337
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency might be more indirect. For example, foo might mention C.t</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rather than B.f, where C.t eventually inlines to B.f.)</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"></span>
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340
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NOTICE that this cannot happen for rules whose head is a</span></span>
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341
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">locally-defined function, because we accurately track dependencies</span></span>
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342
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">through RULES. It only happens for rules whose head is an imported</span></span>
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343
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function (B.f in the example above).</span></span>
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344
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"></span>
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345
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution:</span></span>
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346
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - When simplifying, bring all top level identifiers into</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> scope at the start, ignoring the Rec/NonRec structure, so</span></span>
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348
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that when 'h' pops up in f's rhs, we find it in the in-scope set</span></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (as the simplifier generally expects). This happens in simplTopBinds.</span></span>
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350
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"></span>
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351
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - In the occurrence analyser, if there are any out-of-scope</span></span>
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352
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrences that pop out of the top, which will happen after</span></span>
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353
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> firing the rule: f = \x -> h x</span></span>
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354
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = \y -> 3</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then just glom all the bindings into a single Rec, so that</span></span>
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356
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the *next* iteration of the occurrence analyser will sort</span></span>
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357
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> them all out. This part happens in occurAnalysePgm.</span></span>
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358
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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359
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"></span>
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360
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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361
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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362
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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363
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Bindings</span></span>
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364
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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365
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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366
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"></span>
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367
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recursive bindings: the grand plan]</span></span>
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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we come across a binding group</span></span>
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370
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { x1 = r1; ...; xn = rn }</span></span>
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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we treat it like this (occAnalRecBind):</span></span>
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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"></span>
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373
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Note [Forming Rec groups]</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Occurrence-analyse each right hand side, and build a</span></span>
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375
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> "Details" for each binding to capture the results.</span></span>
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376
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Wrap the details in a LetrecNode, ready for SCC analysis.</span></span>
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377
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> All this is done by makeNode.</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Do SCC-analysis on these Nodes:</span></span>
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380
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Each CyclicSCC will become a new Rec</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Each AcyclicSCC will become a new NonRec</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The key property is that every free variable of a binding is</span></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> accounted for by the scope edges, so that when we are done</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> everything is still in scope.</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. For each AcyclicSCC, just make a NonRec binding.</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">4. For each CyclicSCC of the scope-edge SCC-analysis in (2), we</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> identify suitable loop-breakers to ensure that inlining terminates.</span></span>
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390
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is done by occAnalRec.</span></span>
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391
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"></span>
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392
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4a To do so we form a new set of Nodes, with the same details, but</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> different edges, the "loop-breaker nodes". The loop-breaker nodes</span></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have both more and fewer dependencies than the scope edges</span></span>
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395
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Choosing loop breakers])</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"></span>
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397
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More edges: if f calls g, and g has an active rule that mentions h</span></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then we add an edge from f -> h</span></span>
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399
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"></span>
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400
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Fewer edges: we only include dependencies on active rules, on rule</span></span>
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401
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RHSs (not LHSs) and if there is an INLINE pragma only</span></span>
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402
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> on the stable unfolding (and vice versa). The scope</span></span>
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403
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> edges must be much more inclusive.</span></span>
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404
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"></span>
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405
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4b. The "weak fvs" of a node are, by definition:</span></span>
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406
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the scope fvs - the loop-breaker fvs</span></span>
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407
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Weak loop breakers], and the nd_weak field of Details</span></span>
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408
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"></span>
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409
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Dead code]</span></span>
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410
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~</span></span>
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411
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Dropping dead code for a cyclic Strongly Connected Component is done</span></span>
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412
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a very simple way:</span></span>
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413
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"></span>
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414
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the entire SCC is dropped if none of its binders are mentioned</span></span>
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415
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the body; otherwise the whole thing is kept.</span></span>
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508
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416
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"></span>
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509
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for each RULE for an *imported* function we are going to add</span></span>
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510
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency edges between the *local* FVS of the rule LHS and the</span></span>
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511
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*local* FVS of the rule RHS. We don't do anything special for RULES on</span></span>
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512
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">local functions because the standard occurrence analysis stuff is</span></span>
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pretty good at getting loop-breakerness correct there.</span></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key observation is that dead code elimination happens after</span></span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency analysis: so 'occAnalBind' processes SCCs instead of the</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">original term's binding groups.</span></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It is important to note that even with this extra hack we aren't always going to get</span></span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">things right. For example, it might be that the rule LHS mentions an imported Id,</span></span>
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and another module has a RULE that can rewrite that imported Id to one of our local</span></span>
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ids.</span></span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Thus 'occAnalBind' does indeed drop 'f' in an example like</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Specialising imported functions] (referred to from Specialise)</span></span>
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">BUT for *automatically-generated* rules, the programmer can't be</span></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">responsible for the "programmer error" in Note [Rules for imported</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions]. In particular, consider specialising a recursive function</span></span>
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<pre style="margin: 0;">-<span id="LC525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defined in another module. If we specialise a recursive function B.g,</span></span>
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<pre style="margin: 0;">-<span id="LC526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we get</span></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g_spec = .....(B.g Int).....</span></span>
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<pre style="margin: 0;">-<span id="LC528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE B.g Int = g_spec</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, g_spec doesn't look recursive, but when the rule fires, it</span></span>
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<pre style="margin: 0;">-<span id="LC530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">becomes so. And if B.g was mutually recursive, the loop might</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not be as obvious as it is here.</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> letrec f = ...g...</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = ...(...g...)...</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...g...</span></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">To avoid this,</span></span></span>
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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> * When specialising a function that is a loop breaker,</span></span></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> give a NOINLINE pragma to the specialised function</span></span></span>
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">when 'g' no longer uses 'f' at all (eg 'f' does not occur in a RULE in</span></span></span>
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<pre style="margin: 0;">+<span id="LC429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">'g'). 'occAnalBind' first consumes 'CyclicSCC g' and then it consumes</span></span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">'AcyclicSCC f', where 'body_usage' won't contain 'f'.</span></span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Glomming]</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RULES for imported Ids can make something at the top refer to something at the bottom:</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \x -> B.g (q x)</span></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = \y -> 3</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Forming Rec groups]</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key point about the "Forming Rec groups" step is that it /preserves</span></span>
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436
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">scoping/. If 'x' is mentioned, it had better be bound somewhere. So if</span></span>
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<pre style="margin: 0;">+<span id="LC437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we start with</span></span>
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438
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = ...h...</span></span>
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439
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; g = ...f...</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ...f... }</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can split into SCCs</span></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = ...h...</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ..f... }</span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NonRec { g = ...f... }</span></span>
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<pre style="margin: 0;">+<span id="LC445" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We put bindings {f = ef; g = eg } in a Rec group if "f uses g" and "g</span></span>
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<pre style="margin: 0;">+<span id="LC447" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">uses f", no matter how indirectly. We do a SCC analysis with an edge</span></span>
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">f -> g if "f mentions g". That is, g is free in:</span></span>
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) the rhs 'ef'</span></span>
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) or the RHS of a rule for f, whether active or inactive</span></span>
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<pre style="margin: 0;">+<span id="LC451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Rules are extra RHSs]</span></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> c) or the LHS or a rule for f, whether active or inactive</span></span>
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<pre style="margin: 0;">+<span id="LC453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Rule dependency info]</span></span>
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> d) the RHS of an /active/ local IMP-RULE</span></span>
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<pre style="margin: 0;">+<span id="LC455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [IMP-RULES: local rules for imported functions]</span></span>
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<pre style="margin: 0;">+<span id="LC456" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(b) and (c) apply regardless of the activation of the RULE, because even if</span></span>
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the rule is inactive its free variables must be bound. But (d) doesn't need</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to worry about this because IMP-RULES are always notionally at the bottom</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the file.</span></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE: B.g (q x) = h x</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are extra RHSs]</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A RULE for 'f' is like an extra RHS for 'f'. That way the "parent"</span></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> keeps the specialised "children" alive. If the parent dies</span></span>
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<pre style="margin: 0;">+<span id="LC466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (because it isn't referenced any more), then the children will die</span></span>
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<pre style="margin: 0;">+<span id="LC467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> too (unless they are already referenced directly).</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Applying this rule makes f refer to h, although f doesn't appear to</span></span>
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<pre style="margin: 0;">-<span id="LC546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">depend on h. (And, as in Note [Rules for imported functions], the</span></span>
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<pre style="margin: 0;">-<span id="LC547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependency might be more indirect. For example, f might mention C.t</span></span>
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<pre style="margin: 0;">-<span id="LC548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rather than B.g, where C.t eventually inlines to B.g.)</span></span>
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<pre style="margin: 0;">+<span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So in Example [eftInt], eftInt and eftIntFB will be put in the</span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> same Rec, even though their 'main' RHSs are both non-recursive.</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NOTICE that this cannot happen for rules whose head is a</span></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">locally-defined function, because we accurately track dependencies</span></span>
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<pre style="margin: 0;">-<span id="LC552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">through RULES. It only happens for rules whose head is an imported</span></span>
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<pre style="margin: 0;">-<span id="LC553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function (B.g in the example above).</span></span>
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<pre style="margin: 0;">+<span id="LC472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We must also include inactive rules, so that their free vars</span></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> remain in scope.</span></span>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution:</span></span>
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<pre style="margin: 0;">-<span id="LC556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - When simplifying, bring all top level identifiers into</span></span>
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<pre style="margin: 0;">-<span id="LC557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> scope at the start, ignoring the Rec/NonRec structure, so</span></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that when 'h' pops up in f's rhs, we find it in the in-scope set</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (as the simplifier generally expects). This happens in simplTopBinds.</span></span>
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475
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<pre style="margin: 0;">+<span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rule dependency info]</span></span>
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476
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<pre style="margin: 0;">+<span id="LC476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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477
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The VarSet in a RuleInfo is used for dependency analysis in the</span></span>
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478
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrence analyser. We must track free vars in *both* lhs and rhs.</span></span>
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479
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Hence use of idRuleVars, rather than idRuleRhsVars in occAnalBind.</span></span>
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480
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Why both? Consider</span></span>
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481
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x = y</span></span>
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482
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<pre style="margin: 0;">+<span id="LC482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f x = v+4</span></span>
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483
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then if we substitute y for x, we'd better do so in the</span></span>
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484
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule's LHS too, so we'd better ensure the RULE appears to mention 'x'</span></span>
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485
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as well as 'v'</span></span>
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560
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486
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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561
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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - In the occurrence analyser, if there are any out-of-scope</span></span>
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562
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<pre style="margin: 0;">-<span id="LC562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> occurrences that pop out of the top, which will happen after</span></span>
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563
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<pre style="margin: 0;">-<span id="LC563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> firing the rule: f = \x -> h x</span></span>
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564
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = \y -> 3</span></span>
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565
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<pre style="margin: 0;">-<span id="LC565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> then just glom all the bindings into a single Rec, so that</span></span>
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566
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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the *next* iteration of the occurrence analyser will sort</span></span>
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567
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> them all out. This part happens in occurAnalysePgm.</span></span>
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487
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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Rules are visible in their own rec group]</span></span>
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488
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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489
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We want the rules for 'f' to be visible in f's right-hand side.</span></span>
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490
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> And we'd like them to be visible in other functions in f's Rec</span></span>
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491
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> group. E.g. in Note [Specialisation rules] we want f' rule</span></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to be visible in both f's RHS, and fs's RHS.</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This means that we must simplify the RULEs first, before looking</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> at any of the definitions. This is done by Simplify.simplRecBind,</span></span>
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496
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when it calls addLetIdInfo.</span></span>
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497
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"></span>
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498
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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499
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Inline rules]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -724,6 +653,13 @@ propagate.</td>
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724
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653
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This appears to be very rare in practice. TODO Perhaps we should gather</span></span>
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725
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654
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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> statistics to be sure.</span></span>
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655
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"></span>
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656
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unfoldings and join points]</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We assume that anything in an unfolding occurs multiple times, since</span></span>
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unfoldings are often copied (that's the whole point!). But we still</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">need to track tail calls for the purpose of finding join points.</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"></span>
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663
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------------------------------------------------------------</span></span>
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664
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Adjusting right-hand sides]</span></span>
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729
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665
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="794" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="730" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -794,45 +730,50 @@ occAnalNonRecBind env lvl imp_rule_edges bndr rhs body_usage</td>
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794
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730
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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795
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731
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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732
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- It's mentioned in the body</span></span>
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797
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage'</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_usage<span class="idiff left right">4</span></span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">final_bndr</span> <span class="n" style="color: #333;">rhs'</span><span class="p">])</span></span>
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733
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage'</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">final_bndr</span> <span class="n" style="color: #333;">rhs'</span><span class="p">])</span></span>
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798
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734
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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799
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735
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<pre style="margin: 0;"> <span id="LC735" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_usage'</span><span class="p">,</span> <span class="n" style="color: #333;">tagged_bndr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagNonRecBinder</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_usage</span> <span class="n" style="color: #333;">bndr</span></span>
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800
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">tagged_bndr</span></span>
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736
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="n" style="color: #333;">final_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagged_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">unf'</span></span>
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737
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdSpecialisation</span><span class="p">`</span> <span class="n" style="color: #333;">mkRuleInfo</span> <span class="n" style="color: #333;">rules'</span></span>
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738
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rule_uds</span></span>
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801
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739
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="haskell"></span>
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802
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get the join info from the *new* decision</span></span>
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803
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741
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points and unfoldings/rules]</span></span>
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804
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742
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_join_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">willBeJoinId_maybe</span> <span class="n" style="color: #333;">tagged_bndr</span></span>
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805
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743
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<pre style="margin: 0;"> <span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">is_join_point</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">mb_join_arity</span></span>
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806
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744
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<pre style="margin: 0;"> <span id="LC744" class="line" lang="haskell"></span>
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807
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<pre style="margin: 0;">-<span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">final_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagged_bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">unf'</span></span>
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808
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<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdSpecialisation</span><span class="p">`</span> <span class="n" style="color: #333;">mkRuleInfo</span> <span class="n" style="color: #333;">rules'</span></span>
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809
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"></span>
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745
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Right hand side ---------</span></span>
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810
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746
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"> <span class="n" style="color: #333;">env1</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_join_point</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join point RHSs]</span></span>
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811
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747
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">certainly_inline</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Cascading inlines]</span></span>
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812
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhsCtxt</span> <span class="n" style="color: #333;">env</span></span>
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813
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749
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="haskell"></span>
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750
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Sources of one-shot information]</span></span>
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815
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751
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env1</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">argOneShots</span> <span class="n" style="color: #333;">dmd</span> <span class="p">}</span></span>
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752
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_uds</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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816
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753
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"></span>
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817
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<pre style="margin: 0;">-<span id="LC817" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage1</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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818
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<pre style="margin: 0;">-<span id="LC818" class="line" lang="haskell"></span>
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819
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<pre style="margin: 0;">-<span id="LC819" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unfoldings</span></span>
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Unfolding ---------</span></span>
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820
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755
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unfoldings and join points]</span></span>
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821
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756
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idUnfolding</span> <span class="n" style="color: #333;">bndr</span></span>
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822
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<pre style="margin: 0;">-<span id="LC822" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_usage</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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823
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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_usage1</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_usage</span></span>
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757
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_uds</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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758
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<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC825" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--<span class="idiff left right"> Rules</span></span></span>
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759
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--<span class="idiff left right">------- Rules ---------</span></span></span>
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826
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760
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Rules are extra RHSs] and Note [Rule dependency info]</span></span>
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827
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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRules</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndr</span></span>
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828
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">andUDs</span> <span class="n" style="color: #333;">rhs_usage2</span> <span class="n" style="color: #333;">rule_uds</span></span>
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831
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage4</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span> <span class="kr" style="font-weight: 600;">of</span></span>
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832
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs_usage3</span></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addManyOccs</span> <span class="n" style="color: #333;">rhs_usage3</span> <span class="n" style="color: #333;">vs</span></span>
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834
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Preventing loops due to imported functions rules]</span></span>
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835
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRules</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndr</span></span>
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762
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="p">(</span><span class="n" style="color: #333;">lookupImpRules</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- imp_rule_uds: consider</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- h = ...</span></span>
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- g = ...</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RULE map g = h</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we want to ensure that h is in scope everwhere</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that g is (since the RULE might turn g into h), so</span></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we make g mention h.</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_rule_uds</span> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"> <span class="n" style="color: #333;">add_rule_uds</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">uds</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">tagged_bndr</span></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"> <span class="n" style="color: #333;">certainly_inline</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Cascading inlines]</span></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occ</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC779" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OneOcc</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_in_lam</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NotInsideLam</span><span class="p">,</span> <span class="n" style="color: #333;">occ_n_br</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -846,13 +787,13 @@ occAnalNonRecBind env lvl imp_rule_edges bndr rhs body_usage</td>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRecBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBind</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For a recursive group, we</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * occ-analyse all the RHSs</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * compute strongly-connected components</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * feed those components to occAnalRec</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRecBind</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">pairs</span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="p">(</span><span class="n" style="color: #333;">occAnalRec</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">lvl</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="n" style="color: #333;">sccs</span></span>
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<pre style="margin: 0;">-<span id="LC851" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a recursive group, we</span></span>
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<pre style="margin: 0;">-<span id="LC852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * occ-analyse all the RHSs</span></span>
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<pre style="margin: 0;">-<span id="LC853" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * compute strongly-connected components</span></span>
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<pre style="margin: 0;">-<span id="LC854" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * feed those components to occAnalRec</span></span>
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"> <span class="n" style="color: #333;">sccs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">SCC</span> <span class="kt" style="color: #458; font-weight: 600;">Details</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"> <span class="n" style="color: #333;">sccs</span> <span class="o" style="font-weight: 600;">=</span> <span class="cp" style="color: #999; font-weight: 600;">{-# SCC "occAnalBind.scc" #-}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -866,14 +807,6 @@ occAnalRecBind env lvl imp_rule_edges pairs body_usage</td>
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">`</span><span class="n" style="color: #333;">addInScope</span><span class="p">`</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unfoldings and join points]</span></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We assume that anything in an unfolding occurs multiple times, since unfoldings</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are often copied (that's the whole point!). But we still need to track tail</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calls for the purpose of finding join points.</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRec</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="893" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -893,8 +826,8 @@ occAnalRec _ lvl (AcyclicSCC (ND { nd_bndr = bndr, nd_rhs = rhs</td>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonRec</span> <span class="n" style="color: #333;">tagged_bndr</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">body_uds'</span><span class="p">,</span> <span class="n" style="color: #333;">tagged_bndr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tagNonRecBinder</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">-<span id="LC896" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_uds'</span> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">adjustRhsUsage</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">willBeJoinId_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tagged_bndr</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">NonRecursive</span></span></span>
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<pre style="margin: 0;">-<span id="LC897" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_uds'</span> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">adjustRhsUsage</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonRecursive</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">willBeJoinId_maybe</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tagged_bndr</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The Rec case is the interesting one</span></span>
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -910,15 +843,14 @@ occAnalRec env lvl (CyclicSCC details_s) (body_uds, binds)</td>
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"></span>
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912
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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913
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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="n" style="color: #333;">details_s</span></span>
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914
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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="n" style="color: #333;">details_s</span></span>
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847
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Choosing loop breakers] for loop_breaker_nodes</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make the nodes for the loop-breaker analysis</span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Choosing loop breakers] for loop_breaker_nodes</span></span>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"> <span class="n" style="color: #333;">final_uds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span></span>
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852
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">loop_breaker_nodes</span><span class="p">)</span></span>
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921
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<pre style="margin: 0;">-<span id="LC921" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">loop_breaker_nodes</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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854
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"></span>
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------------------</span></span>
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -927,8 +859,8 @@ occAnalRec env lvl (CyclicSCC details_s) (body_uds, binds)</td>
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927
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">---------------------------</span></span>
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928
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now reconstruct the cycle</span></span>
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929
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)]</span></span>
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930
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<pre style="margin: 0;">-<span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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931
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="n" style="color: #333;">pairs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">loop_breaker_nodes</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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932
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If weak_fvs is empty, the loop_breaker_nodes will include</span></span>
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933
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all the edges in the original scope edges [remember,</span></span>
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934
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- weak_fvs is the difference between scope edges and</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -937,14 +869,151 @@ occAnalRec env lvl (CyclicSCC details_s) (body_uds, binds)</td>
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937
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- exactly that case</span></span>
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938
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"></span>
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939
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"></span>
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940
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<pre style="margin: 0;">-<span id="LC940" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------</span></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Loop breaking</span></span>
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942
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Loop breaking</span></span>
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875
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Choosing loop breakers]</span></span>
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879
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Loop breaking is surprisingly subtle. First read the section 4 of</span></span>
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881
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"Secrets of the GHC inliner". This describes our basic plan.</span></span>
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882
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We avoid infinite inlinings by choosing loop breakers, and</span></span>
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883
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensuring that a loop breaker cuts each loop.</span></span>
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884
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"></span>
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885
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Inlining and hs-boot files] in GHC.Core.ToIface, which</span></span>
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886
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deals with a closely related source of infinite loops.</span></span>
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887
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"></span>
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888
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fundamentally, we do SCC analysis on a graph. For each recursive</span></span>
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889
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group we choose a loop breaker, delete all edges to that node,</span></span>
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890
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">re-analyse the SCC, and iterate.</span></span>
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891
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"></span>
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892
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But what is the graph? NOT the same graph as was used for Note</span></span>
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893
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Forming Rec groups]! In particular, a RULE is like an equation for</span></span>
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894
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'f' that is *always* inlined if it is applicable. We do *not* disable</span></span>
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895
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rules for loop-breakers. It's up to whoever makes the rules to make</span></span>
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896
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sure that the rules themselves always terminate. See Note [Rules for</span></span>
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897
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">recursive functions] in GHC.Core.Opt.Simplify</span></span>
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898
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence, if</span></span>
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f's RHS (or its INLINE template if it has one) mentions g, and</span></span>
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901
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g has a RULE that mentions h, and</span></span>
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902
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h has a RULE that mentions f</span></span>
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903
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"></span>
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904
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we *must* choose f to be a loop breaker. Example: see Note</span></span>
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905
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">[Specialisation rules].</span></span>
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906
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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"></span>
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907
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In general, take the free variables of f's RHS, and augment it with</span></span>
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908
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all the variables reachable by RULES from those starting points. That</span></span>
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909
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is the whole reason for computing rule_fv_env in occAnalBind. (Of</span></span>
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910
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">course we only consider free vars that are also binders in this Rec</span></span>
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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group.) See also Note [Finding rule RHS free vars]</span></span>
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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"></span>
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913
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that when we compute this rule_fv_env, we only consider variables</span></span>
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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">free in the *RHS* of the rule, in contrast to the way we build the</span></span>
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915
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Rec group in the first place (Note [Rule dependency info])</span></span>
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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"></span>
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917
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that if 'g' has RHS that mentions 'w', we should add w to</span></span>
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918
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">g's loop-breaker edges. More concretely there is an edge from f -> g</span></span>
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919
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">iff</span></span>
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920
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) g is mentioned in f's RHS `xor` f's INLINE rhs</span></span>
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921
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [Inline rules])</span></span>
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922
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) or h is mentioned in f's RHS, and</span></span>
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g appears in the RHS of an active RULE of h</span></span>
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924
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> or a /transitive sequence/ of /active rules/ starting with h</span></span>
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925
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"></span>
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926
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why "active rules"? See Note [Finding rule RHS free vars]</span></span>
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927
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="haskell"></span>
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928
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why "transitive sequence"? Because active rules apply</span></span>
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929
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unconditionallly, without checking loop-breaker-ness.</span></span>
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930
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Loop breaker dependencies].</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"></span>
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932
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that in Example [eftInt], *neither* eftInt *nor* eftIntFB is</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">chosen as a loop breaker, because their RHSs don't mention each other.</span></span>
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934
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And indeed both can be inlined safely.</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"></span>
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936
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note again that the edges of the graph we use for computing loop breakers</span></span>
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937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are not the same as the edges we use for computing the Rec blocks.</span></span>
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938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's why we use</span></span>
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939
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"></span>
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940
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- makeNode for the Rec block analysis</span></span>
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941
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- makeLoopBreakerNodes for the loop breaker analysis</span></span>
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942
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Finding rule RHS free vars]</span></span>
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944
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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945
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider this real example from Data Parallel Haskell</span></span>
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946
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero :: Array Int -> Array Tag</span></span>
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947
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# INLINE [1] tagZeroes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tagZero xs = pmap (\x -> fromBool (x==0)) xs</span></span>
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949
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"></span>
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950
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "tagZero" [~1] forall xs n.</span></span>
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951
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pmap fromBool <blah blah> = tagZero xs #-}</span></span>
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952
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So tagZero's RHS mentions pmap, and pmap's RULE mentions tagZero.</span></span>
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953
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, tagZero can only be inlined in phase 1 and later, while</span></span>
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954
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the RULE is only active *before* phase 1. So there's no problem.</span></span>
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955
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"></span>
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956
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> To make this work, we look for the RHS free vars only for</span></span>
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957
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *active* rules. That's the reason for the occ_rule_act field</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the OccEnv.</span></span>
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959
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"></span>
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960
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Note [Weak loop breakers]</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is a last nasty wrinkle. Suppose we have</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"></span>
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964
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { f = f_rhs</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h = h_rhs</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = h</span></span>
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969
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...more...</span></span>
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970
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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971
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<pre style="margin: 0;">+<span id="LC971" class="line" lang="haskell"></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Remember that we simplify the RULES before any RHS (see Note</span></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [Rules are visible in their own rec group] above).</span></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we must *not* postInlineUnconditionally 'g', even though</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> its RHS turns out to be trivial. (I'm assuming that 'g' is</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not chosen as a loop breaker.) Why not? Because then we</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> drop the binding for 'g', which leaves it out of scope in the</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE!</span></span>
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980
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here's a somewhat different example of the same thing</span></span>
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982
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Rec { g = h</span></span>
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983
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; h = ...f...</span></span>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; f = f_rhs</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE f [] = g }</span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here the RULE is "below" g, but we *still* can't postInlineUnconditionally</span></span>
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987
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g, because the RULE for f is active throughout. So the RHS of h</span></span>
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988
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> might rewrite to h = ...g...</span></span>
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989
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So g must remain in scope in the output program!</span></span>
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990
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"></span>
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991
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We "solve" this by:</span></span>
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992
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"></span>
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993
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Make g a "weak" loop breaker (OccInfo = IAmLoopBreaker True)</span></span>
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994
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> iff g is a "missing free variable" of the Rec group</span></span>
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995
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"></span>
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996
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A "missing free variable" x is one that is mentioned in an RHS or</span></span>
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997
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> INLINE or RULE of a binding in the Rec group, but where the</span></span>
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998
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependency on x may not show up in the loop_breaker_nodes (see</span></span>
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999
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> note [Choosing loop breakers} above).</span></span>
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1000
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A normal "strong" loop breaker has IAmLoopBreaker False. So</span></span>
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1002
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Inline postInlineUnconditionally</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> strong IAmLoopBreaker False no no</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> weak IAmLoopBreaker True yes no</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> other yes yes</span></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The **sole** reason for this kind of loop breaker is so that</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> postInlineUnconditionally does not fire. Ugh. (Typically it'll</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inline via the usual callSiteInline stuff, so it'll be dead in the</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next pass, so the main Ugh is the tiresome complication.)</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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943
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"></span>
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944
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1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Binding</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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945
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"></span>
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946
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"><span class="n" style="color: #333;">loopBreakNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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947
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- All binders</span></span>
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948
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders whose dependencies may be "missing"</span></span>
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949
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1018
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<pre style="margin: 0;"> <span id="LC1018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Weak loop breakers]</span></span>
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -968,7 +1037,7 @@ recording inlinings for any Ids which aren't marked as "no-inline" as it goes.</td>
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968
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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969
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"></span>
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970
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Return the bindings sorted into a plausible order, and marked with loop breakers.</span></span>
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971
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"><span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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972
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "loopBreakNodes" (ppr nodes) $</span></span>
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973
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">stronglyConnCompFromEdgedVerticesUniqR</span> <span class="n" style="color: #333;">nodes</span><span class="p">)</span></span>
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974
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -977,20 +1046,20 @@ loopBreakNodes depth bndr_set weak_fvs nodes binds</td>
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977
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"></span>
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978
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"> <span class="n" style="color: #333;">loop_break_scc</span> <span class="n" style="color: #333;">scc</span> <span class="n" style="color: #333;">binds</span></span>
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979
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scc</span> <span class="kr" style="font-weight: 600;">of</span></span>
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980
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AcyclicSCC</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">mk_non_loop_breaker</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">weak_fvs</span></span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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981
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<pre style="margin: 0;">-<span id="LC981" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CyclicSCC</span> <span class="n" style="color: #333;">nodes</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AcyclicSCC</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left">nodeBinding</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mk_non_loop_breaker</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">weak_fvs</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CyclicSCC</span> <span class="n" style="color: #333;">nodes</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">nodes</span> <span class="n" style="color: #333;">binds</span></span>
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982
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1051
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"></span>
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983
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------------------</span></span>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VarSet</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Binding</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Choose a loop breaker, mark it no-inline,</span></span>
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and call loopBreakNodes on the rest</span></span>
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<pre style="margin: 0;">-<span id="LC987" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"reOrderNodes"</span></span>
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<pre style="margin: 0;">-<span id="LC988" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">node</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binds</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="n" style="color: #333;">mk_loop_breaker</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">-<span id="LC989" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">nodes</span><span class="p">)</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"reOrderNodes"</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p"><span class="idiff left">[</span></span><span class="n" style="color: #333;"><span class="idiff">node</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binds</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nodeBinding</span></span> <span class="n" style="color: #333;">mk_loop_breaker</span> <span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"><span class="n" style="color: #333;">reOrderNodes</span> <span class="n" style="color: #333;">depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">node</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">nodes</span><span class="p">)</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "reOrderNodes" (vcat [ text "unchosen" <+> ppr unchosen</span></span>
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991
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , text "chosen" <+> ppr chosen_nodes ]) $</span></span>
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992
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">new_depth</span> <span class="n" style="color: #333;"><span class="idiff left">bndr_set</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">unchosen</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC993" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;"><span class="idiff left right">mk_loop_breaker</span></span> <span class="n" style="color: #333;">chosen_nodes</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"> <span class="n" style="color: #333;">loopBreakNodes</span> <span class="n" style="color: #333;">new_depth</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">unchosen</span> <span class="o" style="font-weight: 600;">$</span></span>
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1062
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">nodeBinding</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mk_loop_breaker</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">chosen_nodes</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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995
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">chosen_nodes</span><span class="p">,</span> <span class="n" style="color: #333;">unchosen</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">chooseLoopBreaker</span> <span class="n" style="color: #333;">approximate_lb</span></span>
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996
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">nd_score</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="n" style="color: #333;">node</span><span class="p">))</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1002,20 +1071,24 @@ reOrderNodes depth bndr_set weak_fvs (node : nodes) binds</td>
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- After two iterations (d=0, d=1) give up</span></span>
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and approximate, returning to d=0</span></span>
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1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Binding</span></span>
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">})</span></span>
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1007
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdOccInfo</span><span class="p">`</span> <span class="n" style="color: #333;">strongLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">},</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"><span class="n" style="color: #333;">nodeBinding</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Binding</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="n" style="color: #333;">nodeBinding</span> <span class="n" style="color: #333;">set_id_occ</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">set_id_occ</span> <span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="n" style="color: #333;">mk_loop_breaker</span> <span class="n" style="color: #333;">bndr</span></span>
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdOccInfo</span><span class="p">`</span> <span class="n" style="color: #333;">occ'</span></span>
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1008
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"> <span class="n" style="color: #333;">occ'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strongLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">}</span></span>
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1009
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1083
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"> <span class="n" style="color: #333;">tail_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tailCallInfo</span> <span class="p">(</span><span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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1010
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1084
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<pre style="margin: 0;"> <span id="LC1084" class="line" lang="haskell"></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">LetrecNode</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Binding</span></span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Id</span></span></span>
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<pre style="margin: 0;"> <span id="LC1086" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Weak loop breakers]</span></span>
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="p">(</span><span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">})</span></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">setIdOccInfo</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">occ'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"><span class="n" style="color: #333;">mk_non_loop_breaker</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="n" style="color: #333;">bndr</span></span>
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1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">weak_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIdOccInfo</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">occ'</span></span>
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span></span>
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1017
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1090
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<pre style="margin: 0;"> <span id="LC1090" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">occ'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">weakLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">}</span></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"> <span class="n" style="color: #333;">occ'</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">weakLoopBreaker</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_tail</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tail_info</span> <span class="p">}</span></span>
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1019
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"> <span class="n" style="color: #333;">tail_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tailCallInfo</span> <span class="p">(</span><span class="n" style="color: #333;">idOccInfo</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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1093
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<pre style="margin: 0;"> <span id="LC1093" class="line" lang="haskell"></span>
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1094
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1178,11 +1251,6 @@ ToDo: try using the occurrence info for the inline'd binder.</td>
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<pre style="margin: 0;"> <span id="LC1251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC1252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC1253" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1181" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Mapping from FVs of imported RULE LHSs to RHS FVs</span></span>
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1182
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<pre style="margin: 0;">-<span id="LC1182" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1183" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ImpRuleEdges</span></span>
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<pre style="margin: 0;">-<span id="LC1184" class="line" lang="haskell"><span class="n" style="color: #333;">noImpRuleEdges</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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1185
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<pre style="margin: 0;">-<span id="LC1185" class="line" lang="haskell"></span>
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1186
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1254
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Node</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="kt" style="color: #458; font-weight: 600;">Details</span> <span class="c1" style="color: #998; font-style: italic;">-- Node comes from Digraph</span></span>
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1187
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1255
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The Unique key is gotten from the Id</span></span>
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1188
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1256
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<pre style="margin: 0;"> <span id="LC1256" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Details</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1209,7 +1277,8 @@ data Details</td>
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1209
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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- dependencies might not be respected by loop_breaker_nodes</span></span>
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1210
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Weak loop breakers]</span></span>
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1211
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1279
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"></span>
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1212
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<pre style="margin: 0;">-<span id="LC1212" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Free variables of the RHS of active RULES</span></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Variables bound in this Rec group that are free</span></span>
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1281
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the RHS of an active rule for this bndr</span></span>
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1213
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"></span>
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1214
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1283
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_score</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NodeScore</span></span>
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1215
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1284
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1289" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1220,7 +1289,7 @@ instance Outputable Details where</td>
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1220
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1289
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"uds ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_uds</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1221
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1290
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<pre style="margin: 0;"> <span id="LC1290" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"inl ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_inl</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1222
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1291
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<pre style="margin: 0;"> <span id="LC1291" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"weak ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_weak</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1223
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<pre style="margin: 0;">-<span id="LC1223" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rule ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1292
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<pre style="margin: 0;">+<span id="LC1292" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rule<span class="idiff left right">_rvs</span> ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1224
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<pre style="margin: 0;"> <span id="LC1293" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"score ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">nd_score</span> <span class="n" style="color: #333;">nd</span><span class="p">)</span></span>
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1294
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<pre style="margin: 0;"> <span id="LC1294" class="line" lang="haskell"> <span class="p">])</span></span>
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1226
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1295
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<pre style="margin: 0;"> <span id="LC1295" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1241" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1310" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1241,7 +1310,9 @@ makeNode :: OccEnv -> ImpRuleEdges -> VarSet</td>
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1241
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1310
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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span></span>
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1242
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1311
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<pre style="margin: 0;"> <span id="LC1311" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recursive bindings: the grand plan]</span></span>
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1243
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1312
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<pre style="margin: 0;"> <span id="LC1312" class="line" lang="haskell"><span class="n" style="color: #333;">makeNode</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr_set</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1244
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<pre style="margin: 0;">-<span id="LC1244" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="n" style="color: #333;">details</span> <span class="p">(</span><span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">node_fvs</span><span class="p">)</span></span>
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1313
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<pre style="margin: 0;">+<span id="LC1313" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="p">{</span> <span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">details</span></span>
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1314
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<pre style="margin: 0;">+<span id="LC1314" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_key</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">bndr</span></span>
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1315
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<pre style="margin: 0;">+<span id="LC1315" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_dependencies</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">node_fvs</span> <span class="p">}</span></span>
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1245
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1316
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<pre style="margin: 0;"> <span id="LC1316" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use nonDetKeysUniqSet here as stronglyConnCompFromEdgedVerticesR</span></span>
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1246
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1317
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<pre style="margin: 0;"> <span id="LC1317" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is still deterministic with edges in nondeterministic order as</span></span>
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1247
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1318
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<pre style="margin: 0;"> <span id="LC1318" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- explained in Note [Deterministic SCC] in GHC.Data.Graph.Directed.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1249" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1320" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1249,7 +1320,7 @@ makeNode env imp_rule_edges bndr_set (bndr, rhs)</td>
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1249
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1320
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr'</span></span>
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1250
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1321
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<pre style="margin: 0;"> <span id="LC1321" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs'</span></span>
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1251
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1322
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<pre style="margin: 0;"> <span id="LC1322" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_rhs_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs'</span></span>
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1252
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<pre style="margin: 0;">-<span id="LC1252" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_usage<span class="idiff left right">3</span></span></span>
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1323
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<pre style="margin: 0;">+<span id="LC1323" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_usage</span></span>
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1253
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1324
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_inl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inl_fvs</span></span>
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1254
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1325
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_weak</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">node_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">minusVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">inl_fvs</span></span>
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1255
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1326
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<pre style="margin: 0;"> <span id="LC1326" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">active_rule_fvs</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1258,6 +1329,11 @@ makeNode env imp_rule_edges bndr_set (bndr, rhs)</td>
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1258
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1329
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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"> <span class="n" style="color: #333;">bndr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndr</span> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">unf'</span></span>
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1259
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1330
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<pre style="margin: 0;"> <span id="LC1330" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdSpecialisation</span><span class="p">`</span> <span class="n" style="color: #333;">mkRuleInfo</span> <span class="n" style="color: #333;">rules'</span></span>
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1260
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1331
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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="haskell"></span>
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1332
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<pre style="margin: 0;">+<span id="LC1332" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_uds</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">rule_uds</span></span>
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1333
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<pre style="margin: 0;">+<span id="LC1333" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rules are extra RHSs]</span></span>
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1334
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<pre style="margin: 0;">+<span id="LC1334" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rule dependency info]</span></span>
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1335
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<pre style="margin: 0;">+<span id="LC1335" class="line" lang="haskell"> <span class="n" style="color: #333;">node_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_usage</span></span>
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1336
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<pre style="margin: 0;">+<span id="LC1336" class="line" lang="haskell"></span>
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1261
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1337
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<pre style="margin: 0;"> <span id="LC1337" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get join point info from the *current* decision</span></span>
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1262
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1338
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<pre style="margin: 0;"> <span id="LC1338" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't know what the new decision will be!</span></span>
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1263
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1339
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<pre style="margin: 0;"> <span id="LC1339" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Using the old decision at least allows us to</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1265" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1341" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1265,66 +1341,68 @@ makeNode env imp_rule_edges bndr_set (bndr, rhs)</td>
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1265
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1341
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<pre style="margin: 0;"> <span id="LC1341" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points and unfoldings/rules]</span></span>
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1266
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1342
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<pre style="margin: 0;"> <span id="LC1342" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_join_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJoinId_maybe</span> <span class="n" style="color: #333;">bndr</span></span>
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1267
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1343
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<pre style="margin: 0;"> <span id="LC1343" class="line" lang="haskell"></span>
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1344
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<pre style="margin: 0;">+<span id="LC1344" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Right hand side ---------</span></span>
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1268
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1345
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<pre style="margin: 0;"> <span id="LC1345" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Constructing the edges for the main Rec computation</span></span>
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1269
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1346
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<pre style="margin: 0;"> <span id="LC1346" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Forming Rec groups]</span></span>
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1270
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<pre style="margin: 0;">-<span id="LC1270" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhsCtxt</span> <span class="n" style="color: #333;">env</span></span>
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1272
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<pre style="margin: 0;">-<span id="LC1272" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage1</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span></span>
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1273
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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs'</span> <span class="n" style="color: #333;">body'</span></span>
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1274
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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">andUDs</span> <span class="n" style="color: #333;">rhs_usage1</span> <span class="n" style="color: #333;">rule_uds</span></span>
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1275
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">unf_uds</span></span>
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1276
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<pre style="margin: 0;">-<span id="LC1276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rules are extra RHSs]</span></span>
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1277
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Rule dependency info]</span></span>
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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"> <span class="n" style="color: #333;">node_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_usage3</span></span>
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1347
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<pre style="margin: 0;">+<span id="LC1347" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do not use occAnalRhs because we don't yet know</span></span>
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1348
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<pre style="margin: 0;">+<span id="LC1348" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the final answer for mb_join_arity</span></span>
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1349
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<pre style="margin: 0;">+<span id="LC1349" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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1350
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhsCtxt</span> <span class="n" style="color: #333;">env</span></span>
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1351
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<pre style="margin: 0;">+<span id="LC1351" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rhs_uds</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span></span>
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1352
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<pre style="margin: 0;">+<span id="LC1352" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">bndrs'</span> <span class="n" style="color: #333;">body'</span></span>
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1353
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"></span>
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1354
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- Unfolding ---------</span></span>
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1355
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<pre style="margin: 0;">+<span id="LC1355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unfoldings and join points]</span></span>
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1356
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<pre style="margin: 0;">+<span id="LC1356" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">bndr</span> <span class="c1" style="color: #998; font-style: italic;">-- realIdUnfolding: Ignore loop-breaker-ness</span></span>
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1357
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here because that is what we are setting!</span></span>
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1358
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<pre style="margin: 0;">+<span id="LC1358" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_uds</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="kt" style="color: #458; font-weight: 600;">Recursive</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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1359
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_uds</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableUnfolding</span> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unf_uds</span></span>
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1360
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">inl_uds</span></span>
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1362
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<pre style="margin: 0;">+<span id="LC1362" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inl_fvs: the vars that would become free if the function was inlined;</span></span>
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1363
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- usually that means the RHS, unless the unfolding is a stable one.</span></span>
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1364
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<pre style="margin: 0;">+<span id="LC1364" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note: We could do this only for functions with an *active* unfolding</span></span>
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1365
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (returning emptyVarSet for an inactive one), but is_active</span></span>
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1366
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- isn't the right thing (it tells about RULE activation),</span></span>
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1367
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we'd need more plumbing</span></span>
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1279
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1368
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<pre style="margin: 0;"> <span id="LC1368" class="line" lang="haskell"></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Finding the free variables of the rules</span></span>
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1281
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"> <span class="n" style="color: #333;">is_active</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ_rule_act</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1282
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1369
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="haskell"></span>
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1370
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<pre style="margin: 0;">+<span id="LC1370" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- IMP-RULES --------</span></span>
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1371
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<pre style="margin: 0;">+<span id="LC1371" class="line" lang="haskell"> <span class="n" style="color: #333;">is_active</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ_rule_act</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Activation</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1372
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupImpRules</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span></span>
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1373
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<pre style="margin: 0;">+<span id="LC1373" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impRulesScopeUsage</span> <span class="n" style="color: #333;">imp_rule_info</span></span>
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1374
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<pre style="margin: 0;">+<span id="LC1374" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impRulesActiveFvs</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">imp_rule_info</span></span>
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1375
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<pre style="margin: 0;">+<span id="LC1375" class="line" lang="haskell"></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------- All rules --------</span></span>
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1283
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1377
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<pre style="margin: 0;"> <span id="LC1377" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">CoreRule</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">)]</span></span>
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1284
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1378
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRules</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndr</span></span>
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1379
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<pre style="margin: 0;">+<span id="LC1379" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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1285
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1380
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"></span>
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1286
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<pre style="margin: 0;">-<span id="LC1286" class="line" lang="haskell"> <span class="n" style="color: #333;">rules'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fstOf3</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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1287
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1288" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_rhs_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- Find the RHS fvs</span></span>
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<pre style="margin: 0;">-<span id="LC1289" class="line" lang="haskell"> <span class="n" style="color: #333;">rules_w_rhs_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybe</span> <span class="n" style="color: #333;">id</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">ids</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">AlwaysActive</span><span class="p">,</span> <span class="n" style="color: #333;">ids</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC1290" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">imp_rule_edges</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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1291
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<pre style="margin: 0;">-<span id="LC1291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Preventing loops due to imported functions rules]</span></span>
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<pre style="margin: 0;">-<span id="LC1292" class="line" lang="haskell"> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">ru_act</span> <span class="n" style="color: #333;">rule</span><span class="p">,</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span></span>
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1293
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<pre style="margin: 0;">-<span id="LC1293" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">rule</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rules_w_uds</span> <span class="p">]</span></span>
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1294
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<pre style="margin: 0;">-<span id="LC1294" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">-<span id="LC1295" class="line" lang="haskell"> <span class="n" style="color: #333;">active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unionVarSets</span> <span class="p">[</span><span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rules_w_rhs_fvs</span></span>
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<pre style="margin: 0;">-<span id="LC1296" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">is_active</span> <span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_rule_uds</span> <span class="n" style="color: #333;">imp_rule_uds</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"> <span class="n" style="color: #333;">add_rule_uds</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="n" style="color: #333;">uds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">l</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">r</span> <span class="p">`</span><span class="n" style="color: #333;">andUDs</span><span class="p">`</span> <span class="n" style="color: #333;">uds</span></span>
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1298" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Finding the usage details of the INLINE pragma (if any)</span></span>
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1299
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<pre style="margin: 0;">-<span id="LC1299" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">bndr</span> <span class="c1" style="color: #998; font-style: italic;">-- realIdUnfolding: Ignore loop-breaker-ness</span></span>
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1300
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<pre style="margin: 0;">-<span id="LC1300" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here because that is what we are setting!</span></span>
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<pre style="margin: 0;">-<span id="LC1301" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unf_uds</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">rhs_env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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1384
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"> <span class="n" style="color: #333;">active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_active_rule</span> <span class="n" style="color: #333;">imp_rule_fvs</span> <span class="n" style="color: #333;">rules_w_uds</span></span>
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<pre style="margin: 0;">+<span id="LC1385" class="line" lang="haskell"> <span class="n" style="color: #333;">add_active_rule</span> <span class="p">(</span><span class="n" style="color: #333;">rule</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span> <span class="n" style="color: #333;">fvs</span></span>
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<pre style="margin: 0;">+<span id="LC1386" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_active</span> <span class="p">(</span><span class="n" style="color: #333;">ruleActivation</span> <span class="n" style="color: #333;">rule</span><span class="p">)</span></span>
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1387
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<pre style="margin: 0;">+<span id="LC1387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_uds</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">fvs</span></span>
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1388
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<pre style="margin: 0;">+<span id="LC1388" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1389
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<pre style="margin: 0;">+<span id="LC1389" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvs</span></span>
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1302
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1390
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<pre style="margin: 0;"> <span id="LC1390" class="line" lang="haskell"></span>
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1303
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<pre style="margin: 0;">-<span id="LC1303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Find the "nd_inl" free vars; for the loop-breaker phase</span></span>
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1304
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<pre style="margin: 0;">-<span id="LC1304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These are the vars that would become free if the function</span></span>
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1305
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<pre style="margin: 0;">-<span id="LC1305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- was inlinined; usually that means the RHS, unless the</span></span>
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1306
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<pre style="margin: 0;">-<span id="LC1306" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unfolding is a stable one.</span></span>
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1307
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<pre style="margin: 0;">-<span id="LC1307" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note: We could do this only for functions with an *active* unfolding</span></span>
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1308
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<pre style="margin: 0;">-<span id="LC1308" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (returning emptyVarSet for an inactive one), but is_active</span></span>
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1309
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<pre style="margin: 0;">-<span id="LC1309" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- isn't the right thing (it tells about RULE activation),</span></span>
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1310
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<pre style="margin: 0;">-<span id="LC1310" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we'd need more plumbing</span></span>
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1311
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<pre style="margin: 0;">-<span id="LC1311" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_fvs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableUnfolding</span> <span class="n" style="color: #333;">unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">unf_uds</span></span>
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1312
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<pre style="margin: 0;">-<span id="LC1312" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndr_set</span> <span class="n" style="color: #333;">rhs_usage1</span></span>
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1313
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1391
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<pre style="margin: 0;"> <span id="LC1391" class="line" lang="haskell"></span>
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1314
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1392
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<pre style="margin: 0;"> <span id="LC1392" class="line" lang="haskell"><span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TopLevelFlag</span></span>
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1315
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<pre style="margin: 0;">-<span id="LC1315" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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1316
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1393
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="c1" style="color: #998; font-style: italic;">-- for BODY of let</span></span>
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1317
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Details</span><span class="p">]</span></span>
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1318
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1395
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- adjusted</span></span>
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1319
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1396
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<pre style="margin: 0;"> <span id="LC1396" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LetrecNode</span><span class="p">])</span></span>
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1320
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<pre style="margin: 0;">-<span id="LC1320" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does four things</span></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function primarily creates the Nodes for the</span></span>
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1398
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<pre style="margin: 0;">+<span id="LC1398" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- loop-breaker SCC analysis. More specifically:</span></span>
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1321
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1399
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a) tag each binder with its occurrence info</span></span>
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1322
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1400
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<pre style="margin: 0;"> <span id="LC1400" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b) add a NodeScore to each node</span></span>
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1323
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1401
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<pre style="margin: 0;"> <span id="LC1401" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- c) make a Node with the right dependency edges for</span></span>
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1324
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1402
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<pre style="margin: 0;"> <span id="LC1402" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the loop-breaker SCC analysis</span></span>
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1325
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1403
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<pre style="margin: 0;"> <span id="LC1403" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- d) adjust each RHS's usage details according to</span></span>
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1326
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1404
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the binder's (new) shotness and join-point-hood</span></span>
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1327
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<pre style="margin: 0;">-<span id="LC1327" class="line" lang="haskell"><span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">b<span class="idiff left">ndr_set</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">b</span>ody_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"><span class="n" style="color: #333;">mkLoopBreakerNodes</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">body_uds</span> <span class="n" style="color: #333;">details_s</span></span>
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1328
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1406
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">zipWithEqual</span> <span class="s" style="color: #d14;">"mkLoopBreakerNodes"</span> <span class="n" style="color: #333;">mk_lb_node</span> <span class="n" style="color: #333;">details_s</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span></span>
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1329
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1330
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">final_uds</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1412" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1334,28 +1412,46 @@ mkLoopBreakerNodes env lvl bndr_set body_uds details_s</td>
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1334
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">details_s</span> <span class="p">]</span></span>
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1335
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"></span>
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1336
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_lb_node</span> <span class="n" style="color: #333;">nd</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_inl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inl_fvs</span> <span class="p">})</span> <span class="n" style="color: #333;">new_bndr</span></span>
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1337
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<pre style="margin: 0;">-<span id="LC1337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="n" style="color: #333;">nd'</span> <span class="p">(</span><span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">old_bndr</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">lb_deps</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DigraphNode</span> <span class="p">{</span> <span class="n" style="color: #333;">node_payload</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_nd</span></span>
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_key</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varUnique</span> <span class="n" style="color: #333;">old_bndr</span></span>
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">node_dependencies</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetKeysUniqSet</span> <span class="n" style="color: #333;">lb_deps</span> <span class="p">}</span></span>
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1338
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's OK to use nonDetKeysUniqSet here as</span></span>
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1339
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1419
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<pre style="margin: 0;"> <span id="LC1419" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- stronglyConnCompFromEdgedVerticesR is still deterministic with edges</span></span>
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1340
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1420
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in nondeterministic order as explained in</span></span>
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1341
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1421
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Deterministic SCC] in GHC.Data.Graph.Directed.</span></span>
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1342
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1343
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<pre style="margin: 0;">-<span id="LC1343" class="line" lang="haskell"> <span class="n" style="color: #333;">n<span class="idiff left">d'</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nd</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_score</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">score</span> <span class="p">}</span></span>
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1344
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<pre style="margin: 0;">-<span id="LC1344" class="line" lang="haskell"> <span class="n" style="color: #333;">score</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nodeScore</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">lb_deps</span> <span class="n" style="color: #333;">nd</span></span>
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1423
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"> <span class="n" style="color: #333;">n<span class="idiff left right">ew_nd</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nd</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_bndr</span><span class="p">,</span> <span class="n" style="color: #333;">nd_score</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">score</span> <span class="p">}</span></span>
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1424
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"> <span class="n" style="color: #333;">score</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nodeScore</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">new_bndr</span> <span class="n" style="color: #333;">lb_deps</span> <span class="n" style="color: #333;">nd</span></span>
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1345
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1425
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<pre style="margin: 0;"> <span id="LC1425" class="line" lang="haskell"> <span class="n" style="color: #333;">lb_deps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendFvs_</span> <span class="n" style="color: #333;">rule_fv_env</span> <span class="n" style="color: #333;">inl_fvs</span></span>
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1346
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<pre style="margin: 0;">-<span id="LC1346" class="line" lang="haskell"></span>
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1426
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Loop breaker dependencies]</span></span>
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1347
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"></span>
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1348
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1428
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_fv_env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IdEnv</span> <span class="kt" style="color: #458; font-weight: 600;">IdSet</span></span>
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1349
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<pre style="margin: 0;">-<span id="LC1349" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maps a variable f to the variables from this group</span></span>
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1350
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<pre style="margin: 0;">-<span id="LC1350" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mentioned in RHS of active rules for f</span></span>
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1351
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<pre style="margin: 0;">-<span id="LC1351" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Domain is *subset* of bound vars (others have no rule fvs)</span></span>
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1352
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<pre style="margin: 0;">-<span id="LC1352" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_fv_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transClosureFV</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarEnv</span> <span class="n" style="color: #333;">init_rule_fvs</span><span class="p">)</span></span>
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1353
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<pre style="margin: 0;">-<span id="LC1353" class="line" lang="haskell"> <span class="n" style="color: #333;">init_rule_fvs</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Finding rule RHS free vars]</span></span>
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1354
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<pre style="margin: 0;">-<span id="LC1354" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">trimmed_rule_fvs</span><span class="p">)</span></span>
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1355
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<pre style="margin: 0;">-<span id="LC1355" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rule_fvs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">details_s</span></span>
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1356
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<pre style="margin: 0;">-<span id="LC1356" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">trimmed_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rule_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bndr_set</span></span>
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1357
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<pre style="margin: 0;">-<span id="LC1357" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">trimmed_rule_fvs</span><span class="p">)</span> <span class="p">]</span></span>
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1429
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maps a variable f to the variables from this group</span></span>
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1430
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<pre style="margin: 0;">+<span id="LC1430" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- reachable by a sequence of RULES starting with f</span></span>
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1431
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Domain is *subset* of bound vars (others have no rule fvs)</span></span>
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1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Finding rule RHS free vars]</span></span>
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1433
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why transClosureFV? See Note [Loop breaker dependencies]</span></span>
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1434
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<pre style="margin: 0;">+<span id="LC1434" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_fv_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transClosureFV</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVarEnv</span> <span class="o" style="font-weight: 600;">$</span></span>
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1435
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">rule_fvs</span><span class="p">)</span></span>
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1436
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ND</span> <span class="p">{</span> <span class="n" style="color: #333;">nd_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">nd_active_rule_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rule_fvs</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">details_s</span></span>
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1437
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">rule_fvs</span><span class="p">)</span> <span class="p">]</span></span>
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1438
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"></span>
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1439
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Loop breaker dependencies]</span></span>
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1440
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1441
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The loop breaker dependencies of x in a recursive</span></span>
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1442
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<pre style="margin: 0;">+<span id="LC1442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">group { f1 = e1; ...; fn = en } are:</span></span>
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1358
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1443
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"></span>
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1444
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<pre style="margin: 0;">+<span id="LC1444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- The "inline free variables" of f: the fi free in</span></span>
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1445
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<pre style="margin: 0;">+<span id="LC1445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> either f's unfolding (if f has a stable unfolding)</span></span>
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1446
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of f's RHS (if not)</span></span>
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1447
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="haskell"></span>
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1448
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- Any fi reachable from those inline free variables by a sequence</span></span>
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1449
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<pre style="margin: 0;">+<span id="LC1449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of RULE rewrites. Remember, rule rewriting is not affected</span></span>
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1450
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by fi being a loop breaker, so we have to take the transitive</span></span>
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> closure in case f is the only possible loop breaker in the loop.</span></span>
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Hence rule_fv_env. We need only account for /active/ rules.</span></span>
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1456" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC1457" class="line" lang="haskell"><span class="n" style="color: #333;">nodeScore</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1567,29 +1663,31 @@ Hence the is_lb field of NodeScore</td>
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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1570" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">JoinArity</span></span>
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<pre style="margin: 0;">+<span id="LC1666" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">RecFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">JoinArity</span></span>
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1573" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occAnalLamOrRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">body</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">body_usage</span><span class="p">,</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC1575" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="p">(</span><span class="n" style="color: #333;">markJoinOneShots</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs'</span><span class="p">)</span> <span class="n" style="color: #333;">body'</span></span>
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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_bndrs</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRec</span> <span class="n" style="color: #333;">is_rec</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs'</span></span>
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markJoinOneShots</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs'</span></span>
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a /non-recursive/ join point we can mark all</span></span>
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- its join-lambda as one-shot; and it's a good idea to do so</span></span>
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Final adjustment</span></span>
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<pre style="margin: 0;">-<span id="LC1580" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">mb_join_arity</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonRecursive</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bndrs'</span></span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;">+<span id="LC1677" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_usage</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mb_join_arity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">final_bndrs</span></span> <span class="n" style="color: #333;">body_usage</span></span>
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1582" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rhs</span>'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1679" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_usage</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">mkLams</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">final_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">body</span>'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1680" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1681" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectBinders</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC1682" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1683" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccEnv</span></span>
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<pre style="margin: 0;">+<span id="LC1684" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RecFlag</span></span>
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">JoinArity</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Join points and unfoldings/rules]</span></span>
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<pre style="margin: 0;"> <span id="LC1686" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span></span>
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<pre style="margin: 0;"> <span id="LC1687" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Occurrence-analyse a stable unfolding;</span></span>
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<pre style="margin: 0;"> <span id="LC1689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- discard a non-stable one altogether.</span></span>
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<pre style="margin: 0;">-<span id="LC1592" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalUnfolding</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">unf</span></span>
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unf</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"> <span class="n" style="color: #333;">unf</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreUnfolding</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">uf_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">src</span> <span class="p">})</span></span>
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1595
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1693
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<pre style="margin: 0;"> <span id="LC1693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableSource</span> <span class="n" style="color: #333;">src</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">unf'</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1698" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1600,7 +1698,7 @@ occAnalUnfolding env mb_join_arity unf</td>
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1600
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1698
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<pre style="margin: 0;"> <span id="LC1698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to guide its decisions. It's ok to leave un-substituted</span></span>
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1601
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1699
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- expressions in the tree because all the variables that were in</span></span>
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1602
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1700
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<pre style="margin: 0;"> <span id="LC1700" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- scope remain in scope; there is no cloning etc.</span></span>
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1603
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<pre style="margin: 0;">-<span id="LC1603" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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1701
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<pre style="margin: 0;">+<span id="LC1701" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">rhs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">rhs</span></span>
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1604
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1702
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<pre style="margin: 0;"> <span id="LC1702" class="line" lang="haskell"></span>
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1605
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1703
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell"> <span class="n" style="color: #333;">unf'</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">noBinderSwaps</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unf</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Unfoldings and rules]</span></span>
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1606
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1704
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unf</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs'</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1897" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1995" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1897,7 +1995,7 @@ occAnalApp env (Var fun, args, ticks)</td>
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1897
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1995
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<pre style="margin: 0;"> <span id="LC1995" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This caused #18296</span></span>
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1898
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<td class="diff-line-num new_line" data-linenumber="1996" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1996
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<pre style="margin: 0;"> <span id="LC1996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fun</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">runRWKey</span></span>
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1899
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<td class="diff-line-num new_line" data-linenumber="1997" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1997
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<pre style="margin: 0;"> <span id="LC1997" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">arg</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">args</span></span>
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1900
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<td class="diff-line-num new_line old" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1900" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">arg</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occAnalRhs</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NonRecursive</span></span><span class="idiff right"> </span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">arg</span></span>
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1901
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1999
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<pre style="margin: 0;"> <span id="LC1999" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">usage</span><span class="p">,</span> <span class="n" style="color: #333;">mkTicks</span> <span class="n" style="color: #333;">ticks</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkApps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">t1</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">])</span></span>
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1902
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2000
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<pre style="margin: 0;"> <span id="LC2000" class="line" lang="haskell"></span>
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1903
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2001
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<pre style="margin: 0;"> <span id="LC2001" class="line" lang="haskell"><span class="n" style="color: #333;">occAnalApp</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">ticks</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2233,6 +2331,7 @@ addAppCtxt :: OccEnv -> [Arg CoreBndr] -> OccEnv</td>
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2233
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<pre style="margin: 0;"> <span id="LC2331" class="line" lang="haskell"><span class="n" style="color: #333;">addAppCtxt</span> <span class="n" style="color: #333;">env</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OccEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">})</span> <span class="n" style="color: #333;">args</span></span>
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2234
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2332
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<pre style="margin: 0;"> <span id="LC2332" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">occ_one_shots</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">valArgCount</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">OneShotLam</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">}</span></span>
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2333
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<pre style="margin: 0;"> <span id="LC2333" class="line" lang="haskell"></span>
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2334
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<pre style="margin: 0;">+<span id="LC2334" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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2236
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2335
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<pre style="margin: 0;"> <span id="LC2335" class="line" lang="haskell"><span class="n" style="color: #333;">transClosureFV</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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2237
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2336
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<pre style="margin: 0;"> <span id="LC2336" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (f,g), (g,h) are in the input, then (f,h) is in the output</span></span>
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2238
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2337
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<pre style="margin: 0;"> <span id="LC2337" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- as well as (f,g), (g,h)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2742" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2643,7 +2742,10 @@ v `usedIn` ud = isExportedId v || v `elemVarEnv` ud_env ud</td>
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2643
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2742
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<pre style="margin: 0;"> <span id="LC2742" class="line" lang="haskell"></span>
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2644
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2743
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<pre style="margin: 0;"> <span id="LC2743" class="line" lang="haskell"><span class="n" style="color: #333;">udFreeVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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2645
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2744
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<pre style="margin: 0;"> <span id="LC2744" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Find the subset of bndrs that are mentioned in uds</span></span>
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2646
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<pre style="margin: 0;">-<span id="LC2646" class="line" lang="haskell"><span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">restrictUniqSetToUFM</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">ud_env</span> <span class="n" style="color: #333;">ud</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2745" class="line" lang="haskell"><span class="n" style="color: #333;">udFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">ud</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">restrictFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">ud_env</span> <span class="n" style="color: #333;">ud</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2746" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2747" class="line" lang="haskell"><span class="n" style="color: #333;">restrictFreeVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">OccInfoEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<pre style="margin: 0;">+<span id="LC2748" class="line" lang="haskell"><span class="n" style="color: #333;">restrictFreeVars</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">restrictUniqSetToUFM</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">fvs</span></span>
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2647
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2749
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<pre style="margin: 0;"> <span id="LC2749" class="line" lang="haskell"></span>
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2648
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2750
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<pre style="margin: 0;"> <span id="LC2750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Do not mark CoVars as dead]</span></span>
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2649
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2751
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<pre style="margin: 0;"> <span id="LC2751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2814" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2712,20 +2814,20 @@ flattenUsageDetails ud</td>
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2712
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2814
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<pre style="margin: 0;"> <span id="LC2814" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2815" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------</span></span>
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<pre style="margin: 0;"> <span id="LC2816" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Adjusting right-hand sides]</span></span>
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<pre style="margin: 0;">-<span id="LC2715" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">JoinArity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">RecFlag</span></span></span>
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<pre style="margin: 0;">+<span id="LC2817" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">RecFlag</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">JoinArity</span></span></span>
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2818
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<pre style="margin: 0;"> <span id="LC2818" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreBndr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Outer lambdas, AFTER occ anal</span></span>
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2819
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<pre style="margin: 0;"> <span id="LC2819" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span> <span class="c1" style="color: #998; font-style: italic;">-- From body of lambda</span></span>
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2820
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<pre style="margin: 0;"> <span id="LC2820" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UsageDetails</span></span>
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<pre style="margin: 0;">-<span id="LC2719" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">mb_join_arity</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rec_flag</span></span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">usage</span></span>
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2720
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<pre style="margin: 0;">-<span id="LC2720" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markAllInsideLamIf</span> <span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shot</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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2821
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<pre style="margin: 0;">+<span id="LC2821" class="line" lang="haskell"><span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">is_rec</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_join_arity</span></span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">usage</span></span>
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2822
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<pre style="margin: 0;">+<span id="LC2822" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">markAllInsideLamIf</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">one_shot</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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2823
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<pre style="margin: 0;"> <span id="LC2823" class="line" lang="haskell"> <span class="n" style="color: #333;">markAllNonTailIf</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">exact_join</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2824
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<pre style="margin: 0;"> <span id="LC2824" class="line" lang="haskell"> <span class="n" style="color: #333;">usage</span></span>
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2825
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<pre style="margin: 0;"> <span id="LC2825" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2724
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2826
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<pre style="margin: 0;"> <span id="LC2826" class="line" lang="haskell"> <span class="n" style="color: #333;">one_shot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2827
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<pre style="margin: 0;"> <span id="LC2827" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">join_arity</span></span>
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2726
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<pre style="margin: 0;">-<span id="LC2726" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRec</span> <span class="n" style="color: #333;"><span class="idiff left right">rec_flag</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2727
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<pre style="margin: 0;">-<span id="LC2727" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="p">(</span><span class="n" style="color: #333;">drop</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span></span>
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2728
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<pre style="margin: 0;">-<span id="LC2728" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="n" style="color: #333;">bndrs</span></span>
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2828
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<pre style="margin: 0;">+<span id="LC2828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRec</span> <span class="n" style="color: #333;"><span class="idiff left right">is_rec</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC2829" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="p">(</span><span class="n" style="color: #333;">drop</span> <span class="n" style="color: #333;">join_arity</span> <span class="n" style="color: #333;">bndrs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2830" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isOneShotBndr</span> <span class="n" style="color: #333;">bndrs</span></span>
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2831
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<pre style="margin: 0;"> <span id="LC2831" class="line" lang="haskell"></span>
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2832
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<pre style="margin: 0;"> <span id="LC2832" class="line" lang="haskell"> <span class="n" style="color: #333;">exact_join</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exactJoin</span> <span class="n" style="color: #333;">mb_join_arity</span> <span class="n" style="color: #333;">bndrs</span></span>
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2833
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<pre style="margin: 0;"> <span id="LC2833" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2908" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2806,7 +2908,7 @@ tagRecBinders lvl body_uds triples</td>
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2806
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2908
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<pre style="margin: 0;"> <span id="LC2908" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- join-point-hood decision</span></span>
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2807
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2909
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<pre style="margin: 0;"> <span id="LC2909" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_udss'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">adjust</span> <span class="n" style="color: #333;">triples</span></span>
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2808
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2910
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<pre style="margin: 0;"> <span id="LC2910" class="line" lang="haskell"> <span class="n" style="color: #333;">adjust</span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_bndrs</span><span class="p">)</span></span>
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2809
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<pre style="margin: 0;">-<span id="LC2809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="n" style="color: #333;"><span class="idiff left">mb_join_arity</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Recursive</span></span> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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<pre style="margin: 0;">+<span id="LC2911" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adjustRhsUsage</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Recursive</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mb_join_arity</span></span> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">rhs_uds</span></span>
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2912
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<pre style="margin: 0;"> <span id="LC2912" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2913
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<pre style="margin: 0;"> <span id="LC2913" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Can't use willBeJoinId_maybe here because we haven't tagged the</span></span>
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2914
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<pre style="margin: 0;"> <span id="LC2914" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- binder yet (the tag depends on these adjustments!)</span></span>
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<li id="cc97d81e7223ad4a3a5e801156ca632f9fa75654">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1347" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1347,8 +1347,10 @@ hsExprNeedsParens p = go</td>
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1347
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<pre style="margin: 0;"> <span id="LC1347" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ExpansionExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExpanded</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">hsExprNeedsParens</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span></span>
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1348
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1348
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<pre style="margin: 0;"> <span id="LC1348" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">p</span></span>
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1349
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1349
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<pre style="margin: 0;"> <span id="LC1349" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpanded</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">hsExprNeedsParens</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">900</span></span>
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1350
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1351
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<pre style="margin: 0;"> <span id="LC1351" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1351
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1352
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<pre style="margin: 0;"> <span id="LC1352" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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1354
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<pre style="margin: 0;"> <span id="LC1354" class="line" lang="haskell"></span>
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1355
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<pre style="margin: 0;"> <span id="LC1355" class="line" lang="haskell"></span>
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1356
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<pre style="margin: 0;"> <span id="LC1356" class="line" lang="haskell"><span class="cd">-- | @'parenthesizeHsExpr' p e@ checks if @'hsExprNeedsParens' p e@ is true,</span></span>
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<li id="ac0a6473a902628a18b3a470122e5cc1ce09de14">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#ac0a6473a902628a18b3a470122e5cc1ce09de14"><strong>compiler/GHC/HsToCore/PmCheck.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -221,7 +221,7 @@ safe (@f _ = error "boom"@ is not because of ⊥), doesn't trigger a warning</td>
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221
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221
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exception into divergence (@f x = f x@).</span></span>
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222
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222
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Semantically, unlike every other case expression, -XEmptyCase is strict in its</span></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match var x, which rules out ⊥ as an inhabitant. So we add x <span class="idiff left right">/~</span> ⊥ to the</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match var x, which rules out ⊥ as an inhabitant. So we add x <span class="idiff left right">≁</span> ⊥ to the</span></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">initial Nabla and check if there are any values left to match on.</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -781,28 +781,6 @@ This means we can't just desugar the pattern match to</td>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@[T a b <- x, 'a' <- a, 42 <- b]@. Instead we have to force them in the</span></span>
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782
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right order: @[T a b <- x, 42 <- b, 'a' <- a]@.</span></span>
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783
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"></span>
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784
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Strict fields and fields of unlifted type]</span></span>
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785
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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786
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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How do strict fields play into Note [Field match order for RecCon]? Answer:</span></span>
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787
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<pre style="margin: 0;">-<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">They don't. Desugaring is entirely unconcerned by strict fields; the forcing</span></span>
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788
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<pre style="margin: 0;">-<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happens *before* pattern matching. But for each strict (or more generally,</span></span>
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789
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<pre style="margin: 0;">-<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unlifted) field @s@ we have to add @s /~ ⊥@ constraints when we check the PmCon</span></span>
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790
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<pre style="margin: 0;">-<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guard in 'checkGrd'. Strict fields are devoid of ⊥ by construction, there's</span></span>
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<pre style="margin: 0;">-<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nothing that a bang pattern would act on. Example from #18341:</span></span>
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<pre style="margin: 0;">-<span id="LC792" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT !Int</span></span>
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _) | False = () -- inaccessible</span></span>
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<pre style="margin: 0;">-<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT !_) | False = () -- redundant, not only inaccessible!</span></span>
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<pre style="margin: 0;">-<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = ()</span></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The second clause desugars to @MkT n <- x, !n@. When coverage checked, the</span></span>
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<pre style="margin: 0;">-<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'PmCon' @MkT n <- x@ refines the set of values that reach the bang pattern with</span></span>
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the constraints @x ~ MkT n, n /~ ⊥@ (this list is computed by 'pmConCts').</span></span>
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Checking the 'PmBang' @!n@ will then try to add the constraint @n ~ ⊥@ to this</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">set to get the diverging set, which is found to be empty. Hence the whole</span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">clause is detected as redundant, as expected.</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Order of guards matters]</span></span>
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<pre style="margin: 0;"> <span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Similar to Note [Field match order for RecCon], the order in which the guards</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -872,17 +850,17 @@ instance Outputable a => Outputable (CheckResult a) where</td>
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"> <span class="n" style="color: #333;">field</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">equals</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">value</span></span>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"><span class="cd">-- | Lift 'addPmCts' over 'Nablas'.</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtsNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">liftNablasM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPm</span>Cts</span> <span class="n" style="color: #333;">d</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">nablas</span></span>
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtsNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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854
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">liftNablasM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">d</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPhi</span>Cts</span> <span class="n" style="color: #333;">d</span> <span class="n" style="color: #333;">cts</span><span class="p">)</span> <span class="n" style="color: #333;">nablas</span></span>
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"></span>
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"><span class="cd">-- | 'addPmCtsNablas' for a single 'PmCt'.</span></span>
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879
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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880
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPm</span>CtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nablas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"><span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addPhi</span>CtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="cd">-- | Test if any of the 'Nabla's is inhabited. Currently this is pure, because</span></span>
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we preserve the invariant that there are no uninhabited 'Nabla's. But that</span></span>
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884
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- could change in the future, for example by implementing this function in</span></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms of @notNull <$> <span class="idiff left right">provideEvidence</span> 1 ds@.</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms of @notNull <$> <span class="idiff left right">generateInhabitingPatterns</span> 1 ds@.</span></span>
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886
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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887
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="n" style="color: #333;">isInhabited</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkNablas</span> <span class="n" style="color: #333;">ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">ds</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -938,26 +916,6 @@ throttle limit old@(MkNablas old_ds) new@(MkNablas new_ds)</td>
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938
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916
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">new_ds</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">max</span> <span class="n" style="color: #333;">limit</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">old_ds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Approximate</span><span class="p">,</span> <span class="n" style="color: #333;">old</span><span class="p">)</span></span>
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939
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917
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Precise</span><span class="p">,</span> <span class="n" style="color: #333;">new</span><span class="p">)</span></span>
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940
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918
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="haskell"></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="cd">-- | The 'PmCts' arising from a successful 'PmCon' match @T gammas as ys <- x@.</span></span>
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942
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These include</span></span>
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943
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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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944
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<pre style="margin: 0;">-<span id="LC944" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @gammas@: Constraints arising from the bound evidence vars</span></span>
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945
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * @y /~ ⊥@ constraints for each unlifted field (including strict fields)</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @y@ in @ys@</span></span>
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947
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The constructor constraint itself: @x ~ T as ys@.</span></span>
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948
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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949
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Strict fields and fields of unlifted type].</span></span>
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950
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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"><span class="n" style="color: #333;">pmConCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmCts</span></span>
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951
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<pre style="margin: 0;">-<span id="LC951" class="line" lang="haskell"><span class="n" style="color: #333;">pmConCts</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gammas</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">unlifted</span> <span class="p">`</span><span class="n" style="color: #333;">snocBag</span><span class="p">`</span> <span class="n" style="color: #333;">con_ct</span></span>
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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953
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"> <span class="n" style="color: #333;">gammas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span><span class="p">)</span> <span class="n" style="color: #333;">dicts</span></span>
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"> <span class="n" style="color: #333;">con_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC955" class="line" lang="haskell"> <span class="n" style="color: #333;">unlifted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">listToBag</span> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">PmNotBotCt</span> <span class="n" style="color: #333;">arg</span></span>
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956
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span></span>
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"pmConCts"</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isBanged</span> <span class="n" style="color: #333;">bang</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"></span>
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961
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919
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"><span class="n" style="color: #333;">checkSequence</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">grdtree</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="n" style="color: #333;">anntree</span><span class="p">)</span></span>
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920
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<pre style="margin: 0;"> <span id="LC920" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The implementation is pretty similar to</span></span>
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963
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921
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @traverse1 :: Apply f => (a -> f b) -> NonEmpty a -> f (NonEmpty b)@</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="927" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -969,32 +927,37 @@ checkGrd :: PmGrd -> CheckAction RedSets</td>
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969
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927
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<pre style="margin: 0;"> <span id="LC927" class="line" lang="haskell"><span class="n" style="color: #333;">checkGrd</span> <span class="n" style="color: #333;">grd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">grd</span> <span class="kr" style="font-weight: 600;">of</span></span>
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970
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928
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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- let x = e: Refine with x ~ e</span></span>
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971
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929
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>CoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- </span>tracePm "check:Let" (ppr x <+> char '=' <+> ppr e)</span></span>
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930
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>CoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Let"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'='</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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974
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932
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<pre style="margin: 0;"> <span id="LC932" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span> <span class="p">}</span></span>
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975
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933
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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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976
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934
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bang x _: Diverge on x ~ ⊥, refine with x <span class="idiff left right">/~</span> ⊥</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bang x _: Diverge on x ~ ⊥, refine with x <span class="idiff left right">≁</span> ⊥</span></span>
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978
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936
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmBang</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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979
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<pre style="margin: 0;">-<span id="LC979" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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980
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>NotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"> <span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="938" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"> <span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>NotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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981
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939
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<pre style="margin: 0;"> <span id="LC939" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Dead bang patterns]</span></span>
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982
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940
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<pre style="margin: 0;"> <span id="LC940" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- mb_info = Just info <==> PmBang originates from bang pattern in source</span></span>
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983
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941
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<pre style="margin: 0;"> <span id="LC941" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bangs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitOL</span> <span class="p">(</span><span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">info</span><span class="p">)</span></span>
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984
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<td class="diff-line-num new_line" data-linenumber="942" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
942
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<pre style="margin: 0;"> <span id="LC942" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NilOL</span></span>
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985
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<pre style="margin: 0;">-<span id="LC985" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- </span>tracePm "check:Bang" (ppr x <+> ppr div)</span></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Bang"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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986
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944
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<pre style="margin: 0;"> <span id="LC944" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span><span class="p">,</span> <span class="n" style="color: #333;">rs_bangs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bangs</span> <span class="p">}</span></span>
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987
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945
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<pre style="margin: 0;"> <span id="LC945" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span></span>
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988
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946
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<pre style="margin: 0;"> <span id="LC946" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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989
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<pre style="margin: 0;">-<span id="LC989" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Con: Fall through on x <span class="idiff left right">/~</span> K and refine with x ~ K ys and type info</span></span>
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947
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Con: Fall through on x <span class="idiff left right">≁</span> K and refine with x ~ K ys and type info</span></span>
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990
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948
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmCon</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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991
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949
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">div</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="n" style="color: #333;">con</span></span>
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992
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<pre style="margin: 0;">-<span id="LC992" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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950
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>BotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">mempty</span></span>
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">con_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pmConCts</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC995" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtsNablas</span> <span class="n" style="color: #333;">inc</span> <span class="n" style="color: #333;">con_cts</span></span>
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">uncov</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPmCtNablas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmNotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "checkGrd:Con" (ppr inc $$ ppr grd $$ ppr con_cts $$ ppr matched)</span></span>
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">matched</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPhiCtNablas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">evVarPred</span> <span class="n" style="color: #333;">dicts</span><span class="p">)</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">uncov</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPhiCtNablas</span> <span class="n" style="color: #333;">inc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiNotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"check:Con"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">grd</span></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inc</span></span>
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"div"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">div</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"matched"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">matched</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"uncov"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">uncov</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC961" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRedSets</span> <span class="p">{</span> <span class="n" style="color: #333;">rs_cov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matched</span><span class="p">,</span> <span class="n" style="color: #333;">rs_div</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">div</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncov</span></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Precise</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1028,7 +991,7 @@ checkGRHS (PmGRHS { pg_grds = grds, pg_rhs = rhs_info }) =</td>
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<pre style="margin: 0;"> <span id="LC991" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC992" class="line" lang="haskell"><span class="n" style="color: #333;">checkEmptyCase</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span></span>
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1030
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993
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<pre style="margin: 0;"> <span id="LC993" class="line" lang="haskell"><span class="n" style="color: #333;">checkEmptyCase</span> <span class="n" style="color: #333;">pe</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmEmptyCase</span> <span class="p">{</span> <span class="n" style="color: #333;">pe_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CA</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">inc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1031
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<pre style="margin: 0;">-<span id="LC1031" class="line" lang="haskell"> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">mCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>NotBotCt</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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994
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"> <span class="n" style="color: #333;">unc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>NotBotCt</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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1032
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995
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">CheckResult</span> <span class="p">{</span> <span class="n" style="color: #333;">cr_ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pe</span><span class="p">,</span> <span class="n" style="color: #333;">cr_uncov</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unc</span><span class="p">,</span> <span class="n" style="color: #333;">cr_approx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mempty</span> <span class="p">}</span></span>
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1033
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996
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"></span>
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1034
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997
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"><span class="n" style="color: #333;">checkPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckAction</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1011" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1048,7 +1011,7 @@ How do we do that? Consider</td>
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1048
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"></span>
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1049
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And imagine we set our limit to 1 for the sake of the example. The first clause</span></span>
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1050
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will be checked against the initial Nabla, {}. Doing so will produce an</span></span>
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1051
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<pre style="margin: 0;">-<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Uncovered set of size 2, containing the models {x<span class="idiff left right">/~True} and {x~True,y/~</span>True}.</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Uncovered set of size 2, containing the models {x<span class="idiff left right">≁True} and {x~True,y≁</span>True}.</span></span>
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1052
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also we find the first clause to cover the model {x~True,y~True}.</span></span>
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1053
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"></span>
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1054
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But the Uncovered set we get out of the match is too huge! We somehow have to</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1019" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1056,8 +1019,8 @@ ensure not to make things worse as they are already, so we continue checking</td>
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1056
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a singleton Uncovered set of the initial Nabla {}. Why is this</span></span>
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1057
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sound (wrt. the notion in GADTs Meet Their Match)? Well, it basically amounts</span></span>
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1058
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to forgetting that we matched against the first clause. The values represented</span></span>
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1059
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<pre style="margin: 0;">-<span id="LC1059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by {} are a superset of those represented by its two refinements {x<span class="idiff left right">/~</span>True} and</span></span>
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1060
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<pre style="margin: 0;">-<span id="LC1060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{x~True,y<span class="idiff left right">/~</span>True}.</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by {} are a superset of those represented by its two refinements {x<span class="idiff left right">≁</span>True} and</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{x~True,y<span class="idiff left right">≁</span>True}.</span></span>
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1061
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"></span>
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1062
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This forgetfulness becomes very apparent in the example above: By continuing</span></span>
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1063
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with {} we don't detect the second clause as redundant, as it again covers the</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1275" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1238" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1275,7 +1238,7 @@ getNFirstUncovered vars n (MkNablas nablas) = go n (bagToList nablas)</td>
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1275
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1238
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1276
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<td class="diff-line-num new_line" data-linenumber="1239" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1239
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<pre style="margin: 0;"> <span id="LC1239" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1277
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<td class="diff-line-num new_line" data-linenumber="1240" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1240
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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">nablas</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"> <span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">provideEvidence</span></span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">nabla</span></span>
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1241
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<pre style="margin: 0;">+<span id="LC1241" class="line" lang="haskell"> <span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">generateInhabitingPatterns</span></span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">nabla</span></span>
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1279
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1242
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<pre style="margin: 0;"> <span id="LC1242" class="line" lang="haskell"> <span class="n" style="color: #333;">back</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">front</span><span class="p">)</span> <span class="n" style="color: #333;">nablas</span></span>
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1280
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1243
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<pre style="margin: 0;"> <span id="LC1243" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">front</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">back</span><span class="p">)</span></span>
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1281
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1244
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<pre style="margin: 0;"> <span id="LC1244" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1415" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1415,7 +1378,8 @@ addTyCs :: Origin -> Bag EvVar -> DsM a -> DsM a</td>
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1415
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1378
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCs</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ev_vars</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1416
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1379
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<pre style="margin: 0;"> <span id="LC1379" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1417
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1380
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span><span class="p">)</span></span>
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1418
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPmNablas</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nablas</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPmCtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">)))</span></span>
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1381
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPmNablas</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nablas</span> <span class="o" style="font-weight: 600;">-></span></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"> <span class="n" style="color: #333;">addPhiCtsNablas</span> <span class="n" style="color: #333;">nablas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">))</span></span>
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1419
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span></span>
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1384
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<pre style="margin: 0;"> <span id="LC1384" class="line" lang="haskell"></span>
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1385
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<pre style="margin: 0;"> <span id="LC1385" class="line" lang="haskell"><span class="cd">-- | Add equalities for the 'CoreExpr' scrutinee to the local 'DsM' environment</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1427,7 +1391,7 @@ addCoreScrutTmCs :: Maybe CoreExpr -> [Id] -> DsM a -> DsM a</td>
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1391
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<pre style="margin: 0;"> <span id="LC1391" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span>
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1428
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1392
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<pre style="margin: 0;"> <span id="LC1392" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">scr</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span></span>
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1429
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1393
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"> <span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">locallyExtendPmNablas</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nablas</span> <span class="o" style="font-weight: 600;">-></span></span>
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1430
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<pre style="margin: 0;">-<span id="LC1430" class="line" lang="haskell"> <span class="n" style="color: #333;">addP<span class="idiff left">mCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unitBag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Pm</span>CoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr</span><span class="p">))</span></span>
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1394
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<pre style="margin: 0;">+<span id="LC1394" class="line" lang="haskell"> <span class="n" style="color: #333;">addP<span class="idiff left">hiCtsNablas</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">nablas</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unitBag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Phi</span>CoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">scr</span><span class="p">))</span></span>
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1395
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreScrutTmCs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"addCoreScrutTmCs: scrutinee, but more than one match id"</span></span>
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1432
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1396
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<pre style="margin: 0;"> <span id="LC1396" class="line" lang="haskell"></span>
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1397
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<pre style="margin: 0;"> <span id="LC1397" class="line" lang="haskell"><span class="cd">-- | 'addCoreScrutTmCs', but desugars the 'LHsExpr' first.</span></span>
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<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#16160f179df308e914fffee87ce52c9a048bde89"><strong>compiler/GHC/HsToCore/PmCheck/Ppr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -146,8 +146,8 @@ pprPmVar :: PprPrec -> Id -> PmPprM SDoc</td>
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146
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">pprPmVar</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ask</span></span>
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148
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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149
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">alt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_tvs</span></span><span class="p"><span class="idiff right">,</span></span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPmAltCon</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">typed_wildcard</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">checkRefuts</span> <span class="n" style="color: #333;">x</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">PACA</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">_tvs</span></span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPmAltCon</span> <span class="n" style="color: #333;">prec</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">typed_wildcard</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">checkRefuts</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if we have no info about the parameter and would just print a</span></span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wildcard, also show its type.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -206,7 +206,7 @@ pmExprAsList :: Nabla -> PmAltCon -> [Id] -> Maybe PmExprList</td>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"><span class="n" style="color: #333;">pmExprAsList</span> <span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_con</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">x</span></span>
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209
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">alt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_tvs</span></span><span class="p"><span class="idiff right">,</span></span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">PACA</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alt</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">_tvs</span></span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupSolution</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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210
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_con</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">args</span></span>
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211
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="n" style="color: #333;">go_var</span> <span class="n" style="color: #333;">rev_pref</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">pref</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">nonEmpty</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">rev_pref</span><span class="p">)</span></span>
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<li id="a90b29966ba2a86c0f6927651648cb062f00ea03">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#a90b29966ba2a86c0f6927651648cb062f00ea03"><strong>compiler/GHC/HsToCore/PmCheck/Types.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -25,7 +25,7 @@ module GHC.HsToCore.PmCheck.Types (</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pmLitAsStringLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">coreExprAsPmLit</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Caching residual COMPLETE sets</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ResidualCompleteMatches</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">getRcm</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ResidualCompleteMatches</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">getRcm</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">isRcmInitialised</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * PmAltConSet</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmAltConSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyPmAltConSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEmptyPmAltConSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">elemPmAltConSet</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -33,11 +33,11 @@ module GHC.HsToCore.PmCheck.Types (</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * A 'DIdEnv' where entries may be shared</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Shared</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">emptySDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupSDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sameRepresentativeSDIE</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">setIndirectSDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setEntrySDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">traverseSDIE</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">setIndirectSDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setEntrySDIE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">traverseSDIE</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">entriesSDIE</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * The pattern match oracle</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VarInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabla</span></span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">initNablas</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">liftNablasM</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">PmAltConApp</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VarInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TmState</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">TyState</span></span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p"><span class="idiff left">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nabla</span>s</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">initNablas</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">liftNablasM</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -49,6 +49,7 @@ import GHC.Data.Bag</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.DSet</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.DFM</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -416,7 +417,7 @@ instance Outputable PmEquality where</td>
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"><span class="cd">-- | A data type that caches for the 'VarInfo' of @x@ the results of querying</span></span>
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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'dsGetCompleteMatches' and then striking out all occurrences of @K@ for</span></span>
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<pre style="margin: 0;">-<span id="LC419" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which we already know @x <span class="idiff left right">/~</span> K@ from these sets.</span></span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which we already know @x <span class="idiff left right">≁</span> K@ from these sets.</span></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For motivation, see Section 5.3 in Lower Your Guards.</span></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [Implementation of COMPLETE pragmas]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -437,6 +438,9 @@ data ResidualCompleteMatches</td>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"><span class="n" style="color: #333;">getRcm</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ResidualCompleteMatches</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLikeSet</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"><span class="n" style="color: #333;">getRcm</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RCM</span> <span class="n" style="color: #333;">vanilla</span> <span class="n" style="color: #333;">pragmas</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeToList</span> <span class="n" style="color: #333;">vanilla</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">pragmas</span></span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"><span class="n" style="color: #333;">isRcmInitialised</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ResidualCompleteMatches</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="haskell"><span class="n" style="color: #333;">isRcmInitialised</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RCM</span> <span class="n" style="color: #333;">vanilla</span> <span class="n" style="color: #333;">pragmas</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">vanilla</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isJust</span> <span class="n" style="color: #333;">pragmas</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">ResidualCompleteMatches</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- formats as "[{Nothing,Just},{P,Q}]"</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rcm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">getRcm</span> <span class="n" style="color: #333;">rcm</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -485,6 +489,12 @@ setEntrySDIE :: SharedDIdEnv a -> Id -> a -> SharedDIdEnv a</td>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">sdie</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extendDVarEnv</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">lookupReprAndEntrySDIE</span> <span class="n" style="color: #333;">sdie</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Entry</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="n" style="color: #333;">entriesSDIE</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"><span class="n" style="color: #333;">entriesSDIE</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">preview_entry</span> <span class="p">(</span><span class="n" style="color: #333;">eltsUDFM</span> <span class="n" style="color: #333;">env</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"> <span class="n" style="color: #333;">preview_entry</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Entry</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"> <span class="n" style="color: #333;">preview_entry</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">traverseSDIE</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">f</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"><span class="n" style="color: #333;">traverseSDIE</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">listToUDFM_Directly</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">udfmToList</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">unSDIE</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -501,13 +511,6 @@ instance Outputable a => Outputable (Shared a) where</td>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SharedDIdEnv</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDIE</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">env</span></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"><span class="cd">-- | See 'vi_bot'.</span></span>
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span></span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span></span>
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span></span>
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span></span>
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"><span class="cd">-- | The term oracle state. Stores 'VarInfo' for encountered 'Id's. These</span></span>
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- entries are possibly shared when we figure out that two variables must be</span></span>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equal, thus represent the same set of values.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -522,6 +525,9 @@ data TmState</td>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ An environment for looking up whether we already encountered semantically</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equivalent expressions that we want to represent by the same 'Id'</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- representative.</span></span>
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ts_dirty</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">DIdSet</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Which 'VarInfo' needs to be checked for inhabitants because of new</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- negative constraints (e.g. @x ≁ ⊥@ or @x ≁ K@).</span></span>
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"><span class="cd">-- | Information about an 'Id'. Stores positive ('vi_pos') facts, like @x ~ Just 42@,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -532,11 +538,11 @@ data TmState</td>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Subject to Note [The Pos/Neg invariant] in "GHC.HsToCore.PmCheck.Oracle".</span></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VI</span></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">vi_<span class="idiff left">ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Type</span></span></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The <span class="idiff left right">type of the variable. Important for rejecting possible GADT</span></span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">constructors or incompatible pattern synonyms (@Just42 :: Maybe Int@)</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">vi_<span class="idiff left">id</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Id</span></span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The <span class="idiff left right">'Id' in question. Important for adding new constraints relative to</span></span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">this 'VarInfo' when we don't easily have the 'Id' available</span>.</span></span>
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544
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_pos</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[<span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmAltCon</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyVar</span></span><span class="p"><span class="idiff">],</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Id</span></span><span class="p"><span class="idiff right">])</span>]</span></span>
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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_pos</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">PmAltConApp</span></span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Positive info: 'PmAltCon' apps it is (i.e. @x ~ [Just y, PatSyn z]@), all</span></span>
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547
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- at the same time (i.e. conjunctive). We need a list because of nested</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pattern matches involving pattern synonym</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -552,7 +558,7 @@ data VarInfo</td>
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558
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data T = Leaf Int | Branch T T | Node Int T</span></span>
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559
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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then @x <span class="idiff left right">/~</span> [Leaf, Node]@ means that @x@ cannot match a @Leaf@ or @Node@,</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then @x <span class="idiff left right">≁</span> [Leaf, Node]@ means that @x@ cannot match a @Leaf@ or @Node@,</span></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and hence can only match @Branch@. Is orthogonal to anything from 'vi_pos',</span></span>
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563
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the sense that 'eqPmAltCon' returns @PossiblyOverlap@ for any pairing</span></span>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- between 'vi_pos' and 'vi_neg'.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -576,40 +582,76 @@ data VarInfo</td>
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to recognise completion of a COMPLETE set efficiently for large enums.</span></span>
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583
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"> <span class="p">}</span></span>
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584
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltConApp</span></span>
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586
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PACA</span></span>
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">paca_con</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span></span>
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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">paca_tvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">paca_ids</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"> <span class="p">}</span></span>
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591
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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"><span class="cd">-- | See 'vi_bot'.</span></span>
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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span></span>
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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span></span>
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span></span>
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span></span>
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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598
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltConApp</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">PACA</span><span class="p">{</span><span class="n" style="color: #333;">paca_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">paca_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">paca_ids</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ids</span><span class="p">}</span> <span class="o" style="font-weight: 600;">=</span></span>
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601
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"> <span class="n" style="color: #333;">hsep</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">map</span> <span class="p">((</span><span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'@'</span> <span class="o" style="font-weight: 600;"><></span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ppr</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ids</span><span class="p">)</span></span>
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602
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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"></span>
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579
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">BotInfo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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580
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">empty</span></span></span>
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604
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">underscore</span></span></span>
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581
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605
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<pre style="margin: 0;"> <span id="LC605" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"~⊥"</span></span>
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582
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606
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"≁⊥"</span></span>
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583
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607
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"></span>
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584
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608
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="kr" style="font-weight: 600;">where</span></span>
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586
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">reps</span><span class="p"><span class="idiff left">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">state</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">reps</span></span></span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">state</span> <span class="n" style="color: #333;">reps</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">dirty</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">state</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">reps</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$$</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dirty</span></span></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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590
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<pre style="margin: 0;">-<span id="LC590" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">bot</span> <span class="n" style="color: #333;">cache</span><span class="p">)</span></span>
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591
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<pre style="margin: 0;">-<span id="LC591" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pos</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">neg</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bot</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cache</span><span class="p">]))</span></span>
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">bot</span> <span class="n" style="color: #333;">cache</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">hcat</span> <span class="p">(</span><span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="p">[</span><span class="n" style="color: #333;">pp_x</span><span class="p">,</span> <span class="n" style="color: #333;">pp_pos</span><span class="p">,</span> <span class="n" style="color: #333;">pp_neg</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">bot</span><span class="p">,</span> <span class="n" style="color: #333;">pp_cache</span><span class="p">]))</span></span>
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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618
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_pos</span></span>
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">underscore</span></span>
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620
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">[</span><span class="n" style="color: #333;">p</span><span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'~'</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span> <span class="c1" style="color: #998; font-style: italic;">-- suppress outer [_] if singleton</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'~'</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pos</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_neg</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyPmAltConSet</span> <span class="n" style="color: #333;">neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">underscore</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'≁'</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">neg</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_cache</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">RCM</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">underscore</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cache</span></span>
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628
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="cd">-- | Initial state of the term oracle.</span></span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"><span class="n" style="color: #333;">initTmState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">-<span id="LC595" class="line" lang="haskell"><span class="n" style="color: #333;">initTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">emptySDIE</span> <span class="n" style="color: #333;">emptyCoreMap</span></span>
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="n" style="color: #333;">initTmState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span> <span class="n" style="color: #333;">emptySDIE</span> <span class="n" style="color: #333;">emptyCoreMap</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">emptyDVarSet</span></span></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"><span class="cd">-- | The type oracle state. A poor man's 'GHC.Tc.Solver.Monad.InsertSet': The invariant is</span></span>
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that all constraints in there are mutually compatible.</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="cd">-- | The type oracle state. An 'GHC.Tc.Solver.Monad.InsertSet' that we</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- incrementally add local type constraints to, together with a sequence</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- number that counts the number of times we extended it with new facts.</span></span>
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="p">{</span> <span class="n" style="color: #333;">ty_st_n</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">,</span> <span class="n" style="color: #333;">ty_st_inert</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">InertSet</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="cd">-- | Not user-facing.</span></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="n" style="color: #333;"><span class="idiff left">inert</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">=</span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inert</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="n" style="color: #333;"><span class="idiff left">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><+></span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inert</span></span>
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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="n" style="color: #333;">emptyInert</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"><span class="n" style="color: #333;">initTyState</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="mi" style="color: #099;"><span class="idiff left">0</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">emptyInert</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"><span class="cd">-- | A normalised refinement type ∇ (\"nabla\"), comprised of an inert set of</span></span>
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<pre style="margin: 0;"> <span id="LC646" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- canonical (i.e. mutually compatible) term and type constraints that form the</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- refinement type's predicate.</span></span>
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkNabla</span> <span class="p">{</span> <span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="c1" style="color: #998; font-style: italic;">-- Type oracle; things like a~Int</span></span>
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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TmState</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- Term oracle; things like x~Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkNabla</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">TyState</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type oracle; things like a~Int</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">TmState</span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ Term oracle; things like x~Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC655" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC656" class="line" lang="haskell"><span class="cd">-- | An initial nabla that is always satisfiable</span></span>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"><span class="n" style="color: #333;">initNabla</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#c69516c9e3cf2716177602126901a5efa3e92675"><strong>compiler/GHC/HsToCore/PmCheck/Types.hs-boot</strong>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="haskell"></span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"></span>
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7
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkNablas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">)</span></span>
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8
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">initNablas</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#b2fd0f5f3e0bc9dcc507931c0b7388bf10e925c2"><strong>compiler/GHC/HsToCore/Types.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -14,7 +14,7 @@ import GHC.Types.SrcLoc</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LForeignDecl</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsExpr</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcRnIf</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IfGblEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IfLclEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CompleteMatches</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;"><span class="idiff left">{-#</span></span><span class="idiff"> </span><span class="nn" style="color: #555;"><span class="idiff">SOURCE</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">#-</span></span><span class="p"><span class="idiff">}</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">HsToCore</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PmCheck</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nablas</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nablas</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Error</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1229" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1229,7 +1229,9 @@ instance OutputableBndrId id => Outputable (HsExprArg id) where</td>
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1229
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<pre style="margin: 0;"> <span id="LC1229" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsEPar</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HsEPar"</span></span>
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<pre style="margin: 0;"> <span id="LC1230" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsEWrap</span> <span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ghcPass</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC1231" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"HsEWrap"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">w</span></span>
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1232
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<pre style="margin: 0;">+<span id="LC1232" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">__GLASGOW_HASKELL__</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">900</span></span>
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1233
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<pre style="margin: 0;"> <span id="LC1233" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;">+<span id="LC1234" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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1235
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<pre style="margin: 0;"> <span id="LC1235" class="line" lang="haskell"></span>
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1236
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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XExprTypeArg</span> <span class="n" style="color: #333;">id</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XExprTypeArg</span> <span class="kt" style="color: #458; font-weight: 600;">'Parsed</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2838,7 +2838,6 @@ expectedKindInCtxt :: UserTypeCtxt -> ContextKind</td>
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<pre style="margin: 0;"> <span id="LC2838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Depending on the context, we might accept any kind (for instance, in a TH</span></span>
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2839
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<pre style="margin: 0;"> <span id="LC2839" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- splice), or only certain kinds (like in type signatures).</span></span>
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<pre style="margin: 0;"> <span id="LC2840" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtxt</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span></span>
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<pre style="margin: 0;">-<span id="LC2841" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">ThBrackCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span></span>
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<pre style="margin: 0;"> <span id="LC2841" class="line" lang="haskell"><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhciCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AnyKind</span></span>
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<pre style="margin: 0;"> <span id="LC2842" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The types in a 'default' decl can have varying kinds</span></span>
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<pre style="margin: 0;"> <span id="LC2843" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Extended defaults]" in GHC.Tc.Utils.Env</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#93bba9b9e0195db135fec54160523a427ea042fd"><strong>compiler/GHC/Tc/Types/Origin.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -84,15 +84,12 @@ data UserTypeCtxt</td>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or (x::t, y) = e</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- LHS of a RULE forall</span></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RULE "foo" forall (x :: a -> a). f (Just x) = ...</span></span>
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ResSigCtxt</span> <span class="c1" style="color: #998; font-style: italic;">-- Result type sig</span></span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f x :: t = ....</span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForSigCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- Foreign import or export signature</span></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtxt</span> <span class="c1" style="color: #998; font-style: italic;">-- Types in a default declaration</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InstDeclCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- An instance declaration</span></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True: stand-alone deriving</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- False: vanilla instance declaration</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SpecInstCtxt</span> <span class="c1" style="color: #998; font-style: italic;">-- SPECIALISE instance pragma</span></span>
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ThBrackCtxt</span> <span class="c1" style="color: #998; font-style: italic;">-- Template Haskell type brackets [t| ... |]</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="c1" style="color: #998; font-style: italic;">-- Higher-rank or impredicative situations</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. (f e) where f has a higher-rank type</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We might want to elaborate this</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -136,9 +133,7 @@ pprUserTypeCtxt (StandaloneKindSigCtxt n) = text "a standalone kind signature fo</td>
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133
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeAppCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a type argument"</span></span>
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134
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConArgCtxt</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"the type of the constructor"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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135
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtxt</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"the RHS of the type synonym"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">c</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">ThBrackCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a Template Haskell quotation [t|...|]"</span></span>
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140
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136
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a pattern type signature"</span></span>
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">ResSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a result type signature"</span></span>
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142
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137
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForSigCtxt</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"the foreign declaration for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a type in a `default' declaration"</span></span>
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserTypeCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstDeclCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"an instance declaration"</span></span>
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<li id="1db07ed8cd9bab6b217a8f5a140176d3cb8672fd">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd"><strong>compiler/GHC/Tc/Validity.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="348" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -348,7 +348,6 @@ checkValidType ctxt ty</td>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"> <span class="n" style="color: #333;">rank</span></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtxt</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MustBeMonoType</span></span>
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ResSigCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MustBeMonoType</span></span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rank0</span></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rank1</span></span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TySynCtxt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rank0</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -372,7 +371,6 @@ checkValidType ctxt ty</td>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForSigCtxt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rank1</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SpecInstCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rank1</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ThBrackCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rank1</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">GhciCtxt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArbitraryRank</span></span>
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<pre style="margin: 0;"> <span id="LC375" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarBndrKindCtxt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rank0</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -472,18 +470,81 @@ forAllAllowed ArbitraryRank = True</td>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="n" style="color: #333;">forAllAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LimitedRank</span> <span class="n" style="color: #333;">forall_ok</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall_ok</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"><span class="n" style="color: #333;">forAllAllowed</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"><span class="cd">-- | Indicates whether a 'UserTypeCtxt' represents type-level contexts,</span></span>
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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- kind-level contexts, or both.</span></span>
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<pre style="margin: 0;">+<span id="LC475" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKindCtxt</span></span>
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<pre style="margin: 0;">+<span id="LC476" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A 'UserTypeCtxt' that only represents type-level positions.</span></span>
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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span></span>
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A 'UserTypeCtxt' that only represents kind-level positions.</span></span>
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BothTypeAndKindCtxt</span></span>
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481
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A 'UserTypeCtxt' that can represent both type- and kind-level positions.</span></span>
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<pre style="margin: 0;">+<span id="LC482" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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483
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"></span>
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484
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKindCtxt</span> <span class="kr" style="font-weight: 600;">where</span></span>
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485
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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486
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<pre style="margin: 0;">+<span id="LC486" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"OnlyTypeCtxt"</span></span>
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487
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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"OnlyKindCtxt"</span></span>
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488
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BothTypeAndKindCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"BothTypeAndKindCtxt"</span></span>
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489
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"><span class="cd">-- | Determine whether a 'UserTypeCtxt' can represent type-level contexts,</span></span>
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491
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- kind-level contexts, or both.</span></span>
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492
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKindCtxt</span></span>
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493
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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494
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InfSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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495
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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496
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeAppCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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497
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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498
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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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499
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<pre style="margin: 0;">+<span id="LC499" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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500
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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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501
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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502
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstDeclCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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503
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SpecInstCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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504
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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505
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClassSCCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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506
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SigmaCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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507
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataTyCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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508
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DerivClauseCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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509
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConArgCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span></span>
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510
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Although data constructors can be promoted with DataKinds, we always</span></span>
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511
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- validity-check them as though they are the types of terms. We may need</span></span>
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512
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to revisit this decision if we ever allow visible dependent quantification</span></span>
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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the types of data constructors.</span></span>
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514
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"></span>
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515
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span></span>
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516
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span></span>
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517
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBndrKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span></span>
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518
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span></span>
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519
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span></span>
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520
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamResKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BothTypeAndKindCtxt</span></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Type synonyms can have types and kinds on their RHSs</span></span>
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524
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhciCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BothTypeAndKindCtxt</span></span>
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525
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHCi's :kind command accepts both types and kinds</span></span>
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526
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"></span>
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527
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="cd">-- | Returns 'True' if the supplied 'UserTypeCtxt' is unambiguously not the</span></span>
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528
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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- context for a kind of a type, where the arbitrary use of constraints is</span></span>
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529
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- currently disallowed.</span></span>
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530
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (See @Note [Constraints in kinds]@ in "GHC.Core.TyCo.Rep".)</span></span>
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531
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the 'UserTypeCtxt' can refer to both types and kinds, this function</span></span>
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532
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- conservatively returns 'True'.</span></span>
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533
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- An example of something that is unambiguously the kind of a type is the</span></span>
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535
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @Show a => a -> a@ in @type Foo :: Show a => a -> a@. On the other hand, the</span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- same type in @foo :: Show a => a -> a@ is unambiguously the type of a term,</span></span>
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537
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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not the kind of a type, so it is permitted.</span></span>
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538
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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476
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<pre style="margin: 0;">-<span id="LC476" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We don't allow arbitrary constraints in kinds</span></span>
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<pre style="margin: 0;">-<span id="LC477" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBndrKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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478
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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC479" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC480" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamResKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC481" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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482
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<pre style="margin: 0;">-<span id="LC482" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"><span class="n" style="color: #333;">allConstraintsAllowed</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BothTypeAndKindCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC544" class="line" lang="haskell"><span class="cd">-- | Returns 'True' if the supplied 'UserTypeCtxt' is unambiguously not the</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- context for the type of a term, where visible, dependent quantification is</span></span>
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<pre style="margin: 0;">-<span id="LC486" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- currently disallowed.</span></span>
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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- currently disallowed. If the 'UserTypeCtxt' can refer to both types and</span></span>
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<pre style="margin: 0;">+<span id="LC547" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- kinds, this function conservatively returns 'True'.</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- An example of something that is unambiguously the type of a term is the</span></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @forall a -> a -> a@ in @foo :: forall a -> a -> a@. On the other hand, the</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -496,40 +557,10 @@ allConstraintsAllowed _ = True</td>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @testsuite/tests/dependent/should_fail/T16326_Fail*.hs@ (for places where</span></span>
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558
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- VDQ is disallowed).</span></span>
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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC499" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Currently allowed in the kinds of types...</span></span>
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<pre style="margin: 0;">-<span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KindSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC501" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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502
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ThBrackCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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504
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhciCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC505" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBndrKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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506
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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507
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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508
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamResKindCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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509
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ...but not in the types of terms.</span></span>
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConArgCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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511
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We could envision allowing VDQ in data constructor types so long as the</span></span>
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512
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constructor is only ever used at the type level, but for now, GHC adopts</span></span>
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513
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the stance that VDQ is never allowed in data constructor types.</span></span>
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514
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<pre style="margin: 0;">-<span id="LC514" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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515
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InfSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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516
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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517
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeAppCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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518
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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519
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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520
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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521
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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ResSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We count class constraints as "types of terms". All of the cases below deal</span></span>
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<pre style="margin: 0;">-<span id="LC525" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with class constraints.</span></span>
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<pre style="margin: 0;">-<span id="LC526" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstDeclCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SpecInstCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC528" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClassSCCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC530" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SigmaCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataTyCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC532" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DerivClauseCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"><span class="n" style="color: #333;">vdqAllowed</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">typeOrKindCtxt</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OnlyTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OnlyKindCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BothTypeAndKindCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC564" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Correctness and performance of type synonym validity checking]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1329,11 +1360,9 @@ okIPCtxt (InfSigCtxt {}) = True</td>
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<pre style="margin: 0;"> <span id="LC1360" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC1361" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeAppCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1331
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1362
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<pre style="margin: 0;"> <span id="LC1362" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">PatSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1332
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<pre style="margin: 0;">-<span id="LC1332" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">ResSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1333
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1363
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<pre style="margin: 0;"> <span id="LC1363" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1334
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1364
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<pre style="margin: 0;"> <span id="LC1364" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ConArgCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1335
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1365
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<pre style="margin: 0;"> <span id="LC1365" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForSigCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- ??</span></span>
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1336
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<pre style="margin: 0;">-<span id="LC1336" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">ThBrackCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1337
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1366
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<pre style="margin: 0;"> <span id="LC1366" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhciCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1338
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1367
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<pre style="margin: 0;"> <span id="LC1367" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="kt" style="color: #458; font-weight: 600;">SigmaCtxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1339
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1368
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<pre style="margin: 0;"> <span id="LC1368" class="line" lang="haskell"><span class="n" style="color: #333;">okIPCtxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataTyCtxt</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#15573cb40fce6bde985c520c7e7647ab4c13453e"><strong>hadrian/stack.yaml</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -12,3 +12,6 @@ nix:</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="yaml"> <span class="pi">-</span> <span class="s" style="color: #d14;">git</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="yaml"> <span class="pi">-</span> <span class="s" style="color: #d14;">ncurses</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="yaml"> <span class="pi">-</span> <span class="s" style="color: #d14;">perl</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="yaml"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="yaml"><span class="na" style="color: #008080;">extra-deps</span><span class="pi">:</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="yaml"><span class="pi">-</span> <span class="s" style="color: #d14;">happy-1.20.0</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#9de9b4ec5912bd8bfa5c7fdf03a23a09bb21ef46"><strong>testsuite/tests/pmcheck/should_compile/T18249.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE BangPatterns #-}</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MagicHash #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnboxedTuples #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UnliftedNewtypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE KindSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18249</span> <span class="kr" style="font-weight: 600;">where</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant, not just inaccessible!</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TYPE</span> <span class="kt" style="color: #458; font-weight: 600;">'UnliftedRep</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UVoid</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant in a weird way:</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- there's no way to actually write this function.</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Inhabitation testing currently doesn't find that UVoid is empty,</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but we should be able to detect the bang as redundant.</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- redundant, not just inaccessible!</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="o" style="font-weight: 600;">#</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">#</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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33
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<td class="diff-line-num new new_line" data-linenumber="34" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
34
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="n" style="color: #333;">i</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">I</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">!</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">i</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">3</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span></pre>
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<li id="307f80581cbcfe76d629bd3d5d781205678b0fc3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#307f80581cbcfe76d629bd3d5d781205678b0fc3"><strong>testsuite/tests/pmcheck/should_compile/T18249.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18249.hs:14:8: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an equation for ‘f’: f !_ | False = ...</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18249.hs:25:4: warning: [-Wredundant-bang-patterns]</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> Pattern match has redundant bang</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In an equation for ‘g’: g _ = ...</span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18249.hs:29:16: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In an equation for ‘h’: h (# _, _ #) | False = ...</span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T18249.hs:33:13: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> In an equation for ‘i’: i !_ | False = ...</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T18249.hs:34:13: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> Pattern match is redundant</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> In an equation for ‘i’: i (I# !_) | False = ...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#a52966ece03f9e76a93a2c4ea96b9fb25368723d"><strong>testsuite/tests/pmcheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -134,6 +134,8 @@ test('T17977b', collect_compiler_stats('bytes allocated',10), compile,</td>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18049</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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136
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18249</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns -Wredundant-bang-patterns</span><span class="p">'])</span></span>
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137
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18273</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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138
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140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18341</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#d1d7de5bc3d2b577ac871114201f27e9ccc2f689"><strong>testsuite/tests/simplCore/should_compile/T18603.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NoImplicitPrelude #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Test</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">build</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">id</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybe</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">xs</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rs</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rs</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE [1] mapMaybe #-}</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# RULES</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">"mapMaybe" [~1] forall f xs. mapMaybe f xs</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> = build (\c n -> foldr (mapMaybeFB c f) n xs)</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">"mapMaybeList" [1] forall f. foldr (mapMaybeFB (:) f) [] = mapMaybe f</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> #-}</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE [0] mapMaybeFB #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Inline FB functions] in GHC.List</span></span>
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26
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybeFB</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span></span>
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27
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">mapMaybeFB</span> <span class="n" style="color: #333;">cons</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">next</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">next</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">cons</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">next</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#fc07c260b75644727a8cdc1af5c861a44d4bfb5e"><strong>testsuite/tests/simplCore/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -333,6 +333,7 @@ test('T18347', normal, compile, ['-dcore-lint -O'])</td>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18355</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">OneShot</span><span class="p">')</span> <span class="p">],</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O -ddump-simpl -dsuppress-uniques</span><span class="p">'])</span></span>
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334
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334
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18399</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span>
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335
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335
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18589</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18603</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span>
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336
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># T18649 should /not/ generate a specialisation rule</span></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18649</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O -ddump-rules -Wno-simplifiable-class-constraints</span><span class="p">'])</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#405f5d1cb617045179d54d273156397003f57608"><strong>testsuite/tests/typecheck/should_fail/T18714.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ImpredicativeTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18714</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Any</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#8076d93aadc99b99c0bea670f65e09a979e1ce61"><strong>testsuite/tests/typecheck/should_fail/T18714.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18714.hs:11:14: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Illegal constraint in a kind: forall a. Show a => a -> a</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘Id’, namely</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> ‘(Any :: forall a. Show a => a -> a)’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the type ‘Id (Any :: forall a. Show a => a -> a)’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In the type declaration for ‘F’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/629a10f189a5ebf06cc5d34a872f22830cb2593e...0cc0c034e0b6f47844f62450f80aca9280e2c25f#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -579,3 +579,4 @@ test('T18357a', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18357b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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580
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18455</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18534</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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582
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<pre style="margin: 0;">+<span id="LC582" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18714</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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