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<h3>
Sebastian Graf pushed to branch wip/T18626
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/8819797310092d120eeaf05310e7e01a800b5d7d">88197973</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-29T13:33:15+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Long-distance information for LocalBinds (#18626)
Now `desugarLocalBind` (formerly `desugarLet`) reasons about
* `FunBind`s that
* Have no pattern matches (so which aren't functions)
* Have a singleton match group with a single GRHS
* (which may have guards)
* and looks through trivial post-typechecking `AbsBinds` in doing so
to pick up the introduced renamings.
And desugars to `PmLet` LYG-style guards. Since GRHSs are no longer
denoted simply by `NonEmpty PmGRHS`, but also need to carry a `[PmGrd]`
for the `PmLet`s from `LocalBind`s, I added `PmGRHSs` to capture that.
Since we call out to the desugarer more often, I found that there were
superfluous warnings emitted when desugaring e.g. case expressions.
Thus, I made sure that we deactivate any warnings in the LYG desugaring
steps by the new wrapper function `noCheckDs`.
There's a regression test in `T18626`. Fixes #18626.
</pre>
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<h4>6 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#36e7b8d61b4fae8f65fca3984d01eb4076712f2b">
compiler/GHC/HsToCore/Pmc.hs
</a>
</li>
<li class="file-stats">
<a href="#3050d0d7e4a9e93aebcc1fe0bed898ca6dac5502">
compiler/GHC/HsToCore/Pmc/Check.hs
</a>
</li>
<li class="file-stats">
<a href="#950eaa7de202a2e915b5ff68a4cfd16e972ad359">
compiler/GHC/HsToCore/Pmc/Desugar.hs
</a>
</li>
<li class="file-stats">
<a href="#0036eccef60579fe5f653a10eeb8bf9869964cf4">
compiler/GHC/HsToCore/Pmc/Types.hs
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</li>
<li class="file-stats">
<a href="#bd4e4e3967a6fa58d8c448bb716f8323a7a64157">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18626.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="36e7b8d61b4fae8f65fca3984d01eb4076712f2b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8819797310092d120eeaf05310e7e01a800b5d7d#36e7b8d61b4fae8f65fca3984d01eb4076712f2b"><strong>compiler/GHC/HsToCore/Pmc.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="59" 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">@@ -59,6 +59,7 @@ import GHC.HsToCore.Pmc.Ppr</td>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Origin</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="LC60" 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="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Types</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC64" 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="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="66" 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="67" 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">@@ -66,11 +67,12 @@ import GHC.Utils.Misc</td>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">evVarPred</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</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;">Expr</span> <span class="p">(</span><span class="n" style="color: #333;">dsLExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC74" 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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<pre style="margin: 0;">-<span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.IOEnv</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">unsafeInterleaveM</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.IOEnv</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">u<span class="idiff left">pdEnv</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">u</span>nsafeInterleaveM</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.OrdList</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">mapMaybeM</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC78" 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">@@ -95,12 +97,22 @@ getLdiNablas = do</td>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nablas</span></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">initNablas</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="cd">-- | We need to call the Hs desugarer to get the Core of a let-binding or where</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;">-- clause. We don't want to run the coverage checker when doing so! Efficiency</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is one concern, but also a lack of properly set up long-distance information</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;">-- might trigger warnings that we normally wouldn't emit.</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="n" style="color: #333;">noCheckDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</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;">DsM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="n" style="color: #333;">noCheckDs</span> <span class="n" style="color: #333;">k</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="LC106" 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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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dflags'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="n" style="color: #333;">wopt_unset</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">allPmCheckWarnings</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"> <span class="n" style="color: #333;">updEnv</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">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;">env_top</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">env_top</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">{</span><span class="n" style="color: #333;">hsc_dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dflags'</span><span class="p">}</span> <span class="p">})</span> <span class="n" style="color: #333;">k</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="cd">-- | Check a pattern binding (let, where) for exhaustiveness.</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">pmcPatBind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</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;">Pat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [pmcPatBind only checks PatBindRhs]</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="n" style="color: #333;">pmcPatBind</span> <span class="n" style="color: #333;">ctxt</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">p</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="LC102" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">missing</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLdiNablas</span></span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_bind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarPatBind</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">p</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 class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff right">missing</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLdiNablas</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_bind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">noCheckDs</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="n" style="color: #333;">desugarPatBind</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">var</span> <span class="n" style="color: #333;">p</span></span>
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104
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116
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"pmcPatBind {"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat_bind</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">missing</span><span class="p">])</span></span>
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105
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117
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkPatBind</span> <span class="n" style="color: #333;">pat_bind</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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106
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118
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="129" 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">@@ -117,8 +129,8 @@ pmcGRHSs</td>
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117
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129
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="n" style="color: #333;">pmcGRHSs</span> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">guards</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">grhss</span> <span class="kr" style="font-weight: 600;">_</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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118
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130
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">combined_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl1</span> <span class="n" style="color: #333;">combineSrcSpans</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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119
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131
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">hs_ctxt</span> <span class="n" style="color: #333;">combined_loc</span></span>
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120
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">matches</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">desugarGRHSs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">combined_loc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">empty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">guard</span>s</span></span>
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121
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"> <span class="n" style="color: #333;">m<span class="idiff left">issing</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">getLdiNabla</span>s</span></span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">!</span></span><span class="n" style="color: #333;"><span class="idiff">missing</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">getLdiNabla</span>s</span></span>
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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;">m<span class="idiff left">atches</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">noCheckDs</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">desugarGRHSs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">combined_loc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">empty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">guard</span>s</span></span>
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122
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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;">tracePm</span> <span class="s" style="color: #d14;">"pmcGRHSs"</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span></span>
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123
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135
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Guards:"</span><span class="p">])</span></span>
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124
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136
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="126" 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="138" 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">@@ -126,7 +138,7 @@ pmcGRHSs hs_ctxt guards@(GRHSs _ grhss _) = do</td>
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126
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkGRHSs</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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127
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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;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</span></span>
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128
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140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"> <span class="n" style="color: #333;">formatReportWarnings</span> <span class="n" style="color: #333;">cirbsGRHSs</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">result</span></span>
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129
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<pre style="margin: 0;">-<span id="LC129" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ldiGRHS</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">cr_ret</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">result</span></span><span class="p">)</span></span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ldiGRHS<span class="idiff left">s</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">cr_ret</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">result</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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130
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142
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"></span>
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131
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143
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"><span class="cd">-- | Check a list of syntactic 'Match'es (part of case, functions, etc.), each</span></span>
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132
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144
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with a 'Pat' and one or more 'GRHSs':</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="153" 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="165" 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">@@ -153,7 +165,7 @@ pmcMatches ctxt vars matches = do</td>
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153
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165
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have to force @missing@ before printing out the trace message,</span></span>
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154
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- otherwise we get interleaved output from the solver. This function</span></span>
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155
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167
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- should be strict in @missing@ anyway!</span></span>
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156
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">missing</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLdiNablas</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">missing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLdiNablas</span></span>
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157
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"pmcMatches {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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158
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">vars</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Matches:"</span><span class="p">])</span></span>
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159
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171
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="174" 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">@@ -162,13 +174,13 @@ pmcMatches ctxt vars matches = do</td>
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162
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174
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<pre style="margin: 0;"> <span id="LC174" 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="kr" style="font-weight: 600;">do</span></span>
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163
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This must be an -XEmptyCase. See Note [Checking EmptyCase]</span></span>
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164
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176
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">only</span> <span class="n" style="color: #333;">vars</span></span>
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165
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_case</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarEmptyCase</span> <span class="n" style="color: #333;">var</span></span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_case</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">noCheckDs</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="n" style="color: #333;">desugarEmptyCase</span> <span class="n" style="color: #333;">var</span></span>
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166
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkEmptyCase</span> <span class="n" style="color: #333;">empty_case</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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167
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179
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</span></span>
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168
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180
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"> <span class="n" style="color: #333;">formatReportWarnings</span> <span class="n" style="color: #333;">cirbsEmptyCase</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">result</span></span>
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169
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181
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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170
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182
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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171
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarMatches</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">matches</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">noCheckDs</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="n" style="color: #333;">desugarMatches</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">matches</span></span>
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172
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184
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unCA</span> <span class="p">(</span><span class="n" style="color: #333;">checkMatchGroup</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="n" style="color: #333;">missing</span></span>
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173
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185
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"}: "</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cr_uncov</span> <span class="n" style="color: #333;">result</span><span class="p">))</span></span>
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174
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186
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"> <span class="n" style="color: #333;">formatReportWarnings</span> <span class="n" style="color: #333;">cirbsMatchGroup</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">vars</span> <span class="n" style="color: #333;">result</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="201" 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="213" 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">@@ -201,7 +213,10 @@ ldiMatchGroup (PmMatchGroup matches) = ldiMatch <$> matches</td>
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201
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213
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"></span>
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202
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"><span class="n" style="color: #333;">ldiMatch</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nablas</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span><span class="p">)</span></span>
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203
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215
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"><span class="n" style="color: #333;">ldiMatch</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">pm_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rs_cov</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">ldiGRHS</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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216
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">rs_cov</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">ldiGRHSs</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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217
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"></span>
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218
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="n" style="color: #333;">ldiGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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219
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"><span class="n" style="color: #333;">ldiGRHSs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="p">{</span> <span class="n" style="color: #333;">pgs_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ldiGRHS</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">grhss</span></span>
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205
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">ldiGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nablas</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"><span class="n" style="color: #333;">ldiGRHS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rs_cov</span> <span class="n" style="color: #333;">red</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -277,8 +292,8 @@ cirbsMatch PmMatch { pm_pats = red, pm_grhss = grhss } = do</td>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">is_covered</span><span class="p">)</span> <span class="n" style="color: #333;">markAllRedundant</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cirb</span></span>
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NonEmpty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmGRHS</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Post</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">CIRB</span></span>
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281
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHSs</span> <span class="n" style="color: #333;"><span class="idiff left right">grhss</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">sconcat</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">cirbsGRHS</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">PmGRHSs</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Post</span></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;">CIRB</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHSs</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">PmGRHSs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pgs_grhss</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">grhss</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Semi</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">sconcat</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">cirbsGRHS</span> <span class="n" style="color: #333;">grhss</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="n" style="color: #333;">cirbsGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</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;">CIRB</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;">cirbsGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">red</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</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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<li id="3050d0d7e4a9e93aebcc1fe0bed898ca6dac5502">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8819797310092d120eeaf05310e7e01a800b5d7d#3050d0d7e4a9e93aebcc1fe0bed898ca6dac5502"><strong>compiler/GHC/HsToCore/Pmc/Check.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="167" 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">@@ -167,8 +167,9 @@ checkMatch :: PmMatch Pre -> CheckAction (PmMatch Post)</td>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="n" style="color: #333;">checkMatch</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pm_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="n" style="color: #333;">leftToRight</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">(</span><span class="n" style="color: #333;">checkGrds</span> <span class="n" style="color: #333;">grds</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">checkGRHSs</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</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;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkSequence</span> <span class="n" style="color: #333;">checkGRHS</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</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;">PmGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHSs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="p">{</span> <span class="n" style="color: #333;">pgs_lcls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span> <span class="n" style="color: #333;">lcls</span><span class="p">,</span> <span class="n" style="color: #333;">pgs_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="n" style="color: #333;">leftToRight</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="p">(</span><span class="n" style="color: #333;">checkGrds</span> <span class="n" style="color: #333;">lcls</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">checkSequence</span> <span class="n" style="color: #333;">checkGRHS</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</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="n" style="color: #333;">checkGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</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;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Post</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">checkGRHS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pg_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_info</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<li id="950eaa7de202a2e915b5ff68a4cfd16e972ad359">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8819797310092d120eeaf05310e7e01a800b5d7d#950eaa7de202a2e915b5ff68a4cfd16e972ad359"><strong>compiler/GHC/HsToCore/Pmc/Desugar.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">@@ -26,6 +26,7 @@ import GHC.HsToCore.Pmc.Types</td>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Pmc.Utils</span></span>
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<pre style="margin: 0;"> <span id="LC27" 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;">Expr</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;">App</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">unpackFS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lengthFS</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">bagToList</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">shortCutLit</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">@@ -36,6 +37,7 @@ import GHC.Builtin.Types</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</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">@@ -326,12 +328,14 @@ desugarMatch vars (L match_loc (Match { m_pats = pats, m_grhss = grhss })) = do</td>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tracePm "desugarMatch" (vcat [ppr pats, ppr pats', ppr grhss'])</span></span>
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span> <span class="n" style="color: #333;">pats'</span><span class="p">,</span> <span class="n" style="color: #333;">pm_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss'</span> <span class="p">}</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="LC329" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGRHSs</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">desugarLGRHS</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"desugarGRHSs"</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">nonEmpty</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">grhssGRHSs</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGRHSs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGRHSs</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span> <span class="n" style="color: #333;">grhss</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="LC333" class="line" lang="haskell"> <span class="n" style="color: #333;">lcls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">desugarLocalBinds</span> <span class="p">(</span><span class="n" style="color: #333;">grhssLocalBinds</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"> <span class="n" style="color: #333;">grhss'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">desugarLGRHS</span> <span class="n" style="color: #333;">match_loc</span> <span class="n" style="color: #333;">pp_pats</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"desugarGRHSs"</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">nonEmpty</span></span>
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">grhssGRHSs</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="p">{</span> <span class="n" style="color: #333;">pgs_lcls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GrdVec</span> <span class="n" style="color: #333;">lcls</span><span class="p">,</span> <span class="n" style="color: #333;">pgs_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"><span class="cd">-- | Desugar a guarded right-hand side to a single 'GrdTree'</span></span>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLGRHS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="kt" style="color: #458; font-weight: 600;">Pre</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">@@ -351,7 +355,7 @@ desugarLGRHS match_loc pp_pats (L _loc (GRHS _ gs _)) = do</td>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGuard</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GuardStmt</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span><span class="p">]</span></span>
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352
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356
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"><span class="n" style="color: #333;">desugarGuard</span> <span class="n" style="color: #333;">guard</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">guard</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</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;">desugarBoolGuard</span> <span class="n" style="color: #333;">e</span></span>
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354
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LetStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">binds</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">desugarL<span class="idiff left">et</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">binds</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LetStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">binds</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">desugarL<span class="idiff left">ocalBinds</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">binds</span></span></span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">desugarBind</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LastStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard LastStmt"</span></span>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ParStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard ParStmt"</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">@@ -359,9 +363,39 @@ desugarGuard guard = case guard of</td>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RecStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard RecStmt"</span></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ApplicativeStmt</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"desugarGuard ApplicativeLastStmt"</span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="haskell"><span class="cd">-- | Desugar let-bindings</span></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsLocalBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLet</span> <span class="n" style="color: #333;">_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"><span class="cd">-- | Desugar local bindings to a bunch of 'PmLet' guards.</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Deals only with simple @let@ or @where@ bindings without any polymorphism,</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- recursion, pattern bindings etc.</span></span>
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369
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Long-distance information for HsLocalBinds].</span></span>
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLocalBinds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsLocalBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span><span class="p">]</span></span>
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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLocalBinds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsValBinds</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XValBindsLR</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NValBinds</span> <span class="n" style="color: #333;">binds</span> <span class="kr" style="font-weight: 600;">_</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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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"> <span class="n" style="color: #333;">concatMapM</span> <span class="p">(</span><span class="n" style="color: #333;">concatMapM</span> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">bagToList</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" 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;">LHsBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PmGrd</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">FunBind</span><span class="p">{</span><span class="n" style="color: #333;">fun_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">fun_matches</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mg</span><span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Long-distance information for HsLocalBinds] for why this</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pattern match is so very specific.</span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">Match</span><span class="p">{</span><span class="n" style="color: #333;">m_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">m_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span><span class="p">}]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mg_alts</span> <span class="n" style="color: #333;">mg</span></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span><span class="p">{</span><span class="n" style="color: #333;">grhssGRHSs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHS</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">_grds</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;">grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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380
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"> <span class="n" style="color: #333;">core_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsLExpr</span> <span class="n" style="color: #333;">rhs</span></span>
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381
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><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;">core_rhs</span><span class="p">]</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">AbsBinds</span><span class="p">{</span> <span class="n" style="color: #333;">abs_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">abs_ev_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">abs_exports</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">exports</span><span class="p">,</span> <span class="n" style="color: #333;">abs_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds</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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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Typechecked HsLocalBinds are wrapped in AbsBinds, which carry</span></span>
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- renamings. See Note [Long-distance information for HsLocalBinds]</span></span>
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386
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for the details.</span></span>
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387
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">go_export</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ABExport</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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;">PmGrd</span></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"> <span class="n" style="color: #333;">go_export</span> <span class="kt" style="color: #458; font-weight: 600;">ABE</span><span class="p">{</span><span class="n" style="color: #333;">abe_poly</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">abe_mono</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">abe_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wrap</span><span class="p">}</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIdHsWrapper</span> <span class="n" style="color: #333;">wrap</span></span>
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390
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</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 class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">y</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;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">y</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;">y</span><span class="p">))</span></span>
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391
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">PmLet</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="392" 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">
392
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<pre style="margin: 0;">+<span id="LC392" 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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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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394
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">exps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">go_export</span> <span class="n" style="color: #333;">exports</span></span>
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395
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"> <span class="n" style="color: #333;">bs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">concatMapM</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">bagToList</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">exps</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">bs</span><span class="p">)</span></span>
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397
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="n" style="color: #333;">desugarLocalBinds</span> <span class="n" style="color: #333;">_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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365
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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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366
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400
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"><span class="cd">-- | Desugar a pattern guard</span></span>
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367
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401
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @pat <- e ==> let x = e; <guards for pat <- x>@</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">@@ -447,4 +481,43 @@ a lot of false warnings.</td>
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447
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481
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"></span>
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448
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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;">But we can check whether the coercion is a hole or if it is just refl, in</span></span>
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449
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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;">which case we can drop it.</span></span>
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484
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"></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;">Note [Long-distance information for HsLocalBinds]</span></span>
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486
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<pre style="margin: 0;">+<span id="LC486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">Consider (#18626)</span></span>
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488
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"></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;"> f :: Int -> ()</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;"> f x | y = ()</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;"> where</span></span>
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492
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y = True</span></span>
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493
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"></span>
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494
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x :: ()</span></span>
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495
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x | let y = True, y = ()</span></span>
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496
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"></span>
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497
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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Both definitions are exhaustive, but to make the necessary long-distance</span></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;">connection from @y@'s binding to its use site in a guard, we have to collect</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;">'PmLet' guards for the 'HsLocalBinds' which contain @y@'s definitions.</span></span>
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500
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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell"></span>
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501
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In principle, we are only interested in desugaring local binds that are</span></span>
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502
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'FunBind's, that</span></span>
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503
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"></span>
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504
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Have no pattern matches. If @y@ above had any patterns, it would be a</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;"> function and we can't reason about them anyway.</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;"> * Have singleton match group with a single GRHS.</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;"> Otherwise, what expression to pick in the generated guard @let y = <rhs>@?</span></span>
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508
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It turns out that desugaring type-checked local binds in this way is a bit</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;">more complex than expected: Apparently, all bindings are wrapped in 'AbsBinds'</span></span>
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Nfter type-checking. See Note [AbsBinds] in "GHC.Hs.Binds".</span></span>
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512
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"></span>
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513
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We make sure that there is no polymorphism in the way by checking that there</span></span>
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are no 'abs_tvs' or 'abs_ev_vars' (we don't reason about</span></span>
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515
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@y :: forall a. Eq a => ...@) and that the exports carry no 'HsWrapper's. In</span></span>
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516
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this case, the exports are a simple renaming substitution that we can capture</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;">with 'PmLet'. Ultimately we'll hit those renamed 'FunBind's, though, which is</span></span>
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518
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the whole point.</span></span>
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<pre style="margin: 0;">+<span id="LC519" 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;">The place to store the 'PmLet' guards for @where@ clauses (which are per</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;">'GRHSs') is as a field of 'PmGRHSs'. For plain @let@ guards as in the guards of</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;">@x@, we can simply add them to the 'pg_grds' field of 'PmGRHS'.</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;">-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8819797310092d120eeaf05310e7e01a800b5d7d#0036eccef60579fe5f653a10eeb8bf9869964cf4"><strong>compiler/GHC/HsToCore/Pmc/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">@@ -22,7 +22,7 @@ module GHC.HsToCore.Pmc.Types (</td>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SrcInfo</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;">PmGrd</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;">GrdVec</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="LC23" class="line" lang="haskell"></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;">-- ** Guard tree language</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</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;">PmMatch</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;">PmGRHS</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;">PmPatBind</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;">PmEmptyCase</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="LC25" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PmMatchGroup</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;">PmMatch</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;">PmGRHS<span class="idiff left">s</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">PmGRHS</span></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;">PmPatBind</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;">PmEmptyCase</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="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;">-- * Coverage Checking types</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;">RedSets</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;">Precision</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;">CheckResult</span> <span class="p">(</span><span class="o" style="font-weight: 600;">..</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">@@ -112,7 +112,13 @@ newtype PmMatchGroup p = PmMatchGroup (NonEmpty (PmMatch p))</td>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="cd">-- | A guard tree denoting 'Match': A payload describing the pats and a bunch of</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GRHS.</span></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">pm_grhss</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;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">pm_grhss</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;">PmGRHSs</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="cd">-- | A guard tree denoting 'GRHSs': A bunch of 'PmLet' guards for local</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- bindings from the 'GRHSs's @where@ clauses and the actual list of 'GRHS'.</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;">-- See Note [Long-distance information for HsLocalBinds] in</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "GHC.HsToCore.Pmc.Desugar".</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmGRHSs</span> <span class="p">{</span> <span class="n" style="color: #333;">pgs_lcls</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">pgs_grhss</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;">NonEmpty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmGRHS</span> <span class="n" style="color: #333;">p</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="cd">-- | A guard tree denoting 'GRHS': A payload describing the grds and a 'SrcInfo'</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- useful for printing out in warnings messages.</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">@@ -149,6 +155,10 @@ instance Outputable p => Outputable (PmMatch p) where</td>
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<pre style="margin: 0;"> <span id="LC155" 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;">PmMatch</span> <span class="p">{</span> <span class="n" style="color: #333;">pm_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pm_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">grds</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC158" 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;">p</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;">PmGRHSs</span> <span class="n" style="color: #333;">p</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="LC159" 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;">PmGRHSs</span> <span class="p">{</span> <span class="n" style="color: #333;">pgs_lcls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_lcls</span><span class="p">,</span> <span class="n" style="color: #333;">pgs_grhss</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">grhss</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC162" 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;">p</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;">PmGRHS</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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153
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<pre style="margin: 0;"> <span id="LC163" 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;">PmGRHS</span> <span class="p">{</span> <span class="n" style="color: #333;">pg_grds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grds</span><span class="p">,</span> <span class="n" style="color: #333;">pg_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>
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154
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">grds</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 class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8819797310092d120eeaf05310e7e01a800b5d7d#bd4e4e3967a6fa58d8c448bb716f8323a7a64157"><strong>testsuite/tests/pmcheck/should_compile/T18626.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>
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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;">Lib</span> <span class="kr" style="font-weight: 600;">where</span></span>
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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="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">|</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" 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="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC9" 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="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8819797310092d120eeaf05310e7e01a800b5d7d#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">@@ -148,6 +148,8 @@ test('T18478', collect_compiler_stats('bytes allocated',10), compile,</td>
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148
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<pre style="margin: 0;"> <span id="LC148" 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="LC149" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18533</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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150
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150
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<pre style="margin: 0;"> <span id="LC150" 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="LC151" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18626</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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152
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<pre style="margin: 0;">+<span id="LC152" 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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151
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153
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18572</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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152
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154
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-incomplete-uni-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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153
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155
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18609</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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