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<h3>
Marge Bot pushed to branch master
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/8b51fcbd67ca17a6dcc2f9e5a29176f836bf11d2">8b51fcbd</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-01T10:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Only call checkSingle if we would report warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1">fd7ea0fe</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-01T10:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Pick up `EvVar`s bound in `HsWrapper`s for long-distance info
`HsWrapper`s introduce evidence bindings through `WpEvLam` which the
pattern-match coverage checker should be made aware of.
Failing to do so caused #18049, where the resulting impreciseness of
imcompleteness warnings seemingly contradicted with
`-Winaccessible-code`.
The solution is simple: Collect all the evidence binders of an
`HsWrapper` and add it to the ambient `Deltas` before desugaring
the wrapped expression.
But that means we pick up many more evidence bindings, even when they
wrap around code without a single pattern match to check! That regressed
`T3064` by over 300%, so now we are adding long-distance info lazily
through judicious use of `unsafeInterleaveIO`.
Fixes #18049.
</pre>
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<h4>7 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#65e2067fbb7377818b6cadff0531f44029499948">
compiler/GHC/HsToCore/Binds.hs
</a>
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<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<li class="file-stats">
<a href="#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed">
compiler/GHC/HsToCore/Match.hs
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<li class="file-stats">
<a href="#ac0a6473a902628a18b3a470122e5cc1ce09de14">
compiler/GHC/HsToCore/PmCheck.hs
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<li class="file-stats">
<a href="#46e7b59eca287d43c19d0d8902b41f5d04f0d268">
compiler/GHC/Tc/Types/Evidence.hs
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<li class="file-stats">
<a href="#97ec106b0e095be48dc4424f08d16051fa3201f0">
<span class="new-file">
+
testsuite/tests/pmcheck/should_compile/T18049.hs
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</a>
</li>
<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="65e2067fbb7377818b6cadff0531f44029499948">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/de9fc995c2170bc34600ee3fc80393c67cfecad1...fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1#65e2067fbb7377818b6cadff0531f44029499948"><strong>compiler/GHC/HsToCore/Binds.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="33" 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">@@ -33,7 +33,7 @@ import {-# SOURCE #-} GHC.HsToCore.Match ( matchWrapper )</td>
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<pre style="margin: 0;"> <span id="LC33" 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="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.GuardedRHSs</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Utils</span></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">needToRunPmCheck</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">addTyCsDs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkGuardMatches</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">addTyCsDs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkGuardMatches</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="c1" style="color: #998; font-style: italic;">-- lots of things</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.Core</span> <span class="c1" style="color: #998; font-style: italic;">-- lots of things</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="145" 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="145" 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">@@ -145,12 +145,20 @@ dsHsBind dflags (VarBind { var_id = var</td>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">force_var</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">core_bind</span><span class="p">])</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsBind</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</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 class="idiff left right">_</span></span> <span class="n" style="color: #333;">fun</span></span>
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<td class="diff-line-num new new_line" data-linenumber="148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsBind</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</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="n" style="color: #333;"><span class="idiff left right">loc</span></span> <span class="n" style="color: #333;">fun</span></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="haskell"> <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;">matches</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">co_fn</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun_tick</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tick</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchWrapper</span></span>
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153
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkPrefixFunRhs</span> <span class="p">(</span><span class="n" style="color: #333;">noLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">fun</span><span class="p">))</span></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">args</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCsDs</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="n" style="color: #333;">co_fn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- FromSource might not be accurate (we don't have any</span></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- origin annotations for things in this module), but at</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- worst we do superfluous calls to the pattern match</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- oracle.</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- addTyCsDs: Add type evidence to the refinement type</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- predicate of the coverage checker</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type and Term Equality Propagation] in PmCheck</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"> <span class="n" style="color: #333;">matchWrapper</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkPrefixFunRhs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">fun</span><span class="p">)))</span></span>
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154
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162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">matches</span></span>
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155
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163
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">core_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHsWrapper</span> <span class="n" style="color: #333;">co_fn</span></span>
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156
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164
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">body'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkOptTickBox</span> <span class="n" style="color: #333;">tick</span> <span class="n" style="color: #333;">body</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="189" 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="197" 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">@@ -189,15 +197,7 @@ dsHsBind dflags (AbsBinds { abs_tvs = tyvars, abs_ev_vars = dicts</td>
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189
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197
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<pre style="margin: 0;"> <span id="LC197" 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>
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190
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">abs_ev_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev_binds</span></span>
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191
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199
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"> <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="n" style="color: #333;">abs_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">has_sig</span> <span class="p">})</span></span>
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192
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ds_binds</span> <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;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span><span class="p">)</span></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- FromSource might not be accurate, but at worst</span></span>
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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we do superfluous calls to the pattern match</span></span>
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- oracle.</span></span>
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- addTyCsDs: push type constraints deeper</span></span>
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for inner pattern match check</span></span>
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Check, Note [Type and Term Equality Propagation]</span></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">addTyCsDs</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">dicts</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dsLHsBinds</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ds_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCsDs</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">dicts</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">dsLHsBinds</span> <span class="n" style="color: #333;">binds</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ds_ev_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsTcEvBinds_s</span> <span class="n" style="color: #333;">ev_binds</span></span>
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<pre style="margin: 0;"> <span id="LC203" 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">@@ -206,7 +206,6 @@ dsHsBind dflags (AbsBinds { abs_tvs = tyvars, abs_ev_vars = dicts</td>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsBind</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynBind</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;">"dsHsBind: PatSynBind"</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"><span class="n" style="color: #333;">dsAbsBinds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ABExport</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">]</span></span>
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<li id="6bdd5abc649727f2a802bc96ce5c276de19d3726">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/de9fc995c2170bc34600ee3fc80393c67cfecad1...fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.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">@@ -32,7 +32,7 @@ import GHC.HsToCore.ListComp</td>
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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.HsToCore.Utils</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Arrows</span></span>
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<pre style="margin: 0;"> <span id="LC34" 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="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">checkGuardMatches</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">addTyCsDs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">checkGuardMatches</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>
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<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.Name.Env</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.Core.FamInstEnv</span><span class="p">(</span> <span class="n" style="color: #333;">topNormaliseType</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">@@ -280,7 +280,8 @@ dsExpr hswrap@(XExpr (HsWrap co_fn e))</td>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsConLikeOut</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">varToCoreExpr</span> <span class="p">(</span><span class="n" style="color: #333;">dataConWrapId</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWrap</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"dsExpr: HsWrap inside HsWrap"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hswrap</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsPar</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;">pprPanic</span> <span class="s" style="color: #d14;">"dsExpr: HsPar inside HsWrap"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hswrap</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC283" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">dsExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addTyCsDs</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="p">(</span><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="n" style="color: #333;">co_fn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"> <span class="n" style="color: #333;">dsExpr</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Detecting forced eta expansion]</span></span>
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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wrap'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsHsWrapper</span> <span class="n" style="color: #333;">co_fn</span></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"> <span class="p">;</span> <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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<li id="085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/de9fc995c2170bc34600ee3fc80393c67cfecad1...fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed"><strong>compiler/GHC/HsToCore/Match.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="859" 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">@@ -859,8 +859,10 @@ matchSinglePatVar var ctx pat ty match_result</td>
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <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="LC860" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">locn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanDs</span></span>
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861
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"></span>
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862
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pattern match check warnings</span></span>
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkSingle</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">locn</span><span class="p">)</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pattern match check warnings</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isMatchContextPmChecked</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span> <span class="n" style="color: #333;">ctx</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">checkSingle</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DsMatchContext</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">locn</span><span class="p">)</span> <span class="n" style="color: #333;">var</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">pat</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">eqn_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EqnInfo</span> <span class="p">{</span> <span class="n" style="color: #333;">eqn_pats</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">unLoc</span> <span class="p">(</span><span class="n" style="color: #333;">decideBangHood</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">pat</span><span class="p">)]</span></span>
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eqn_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromSource</span></span>
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<li id="ac0a6473a902628a18b3a470122e5cc1ce09de14">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/de9fc995c2170bc34600ee3fc80393c67cfecad1...fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1#ac0a6473a902628a18b3a470122e5cc1ce09de14"><strong>compiler/GHC/HsToCore/PmCheck.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -14,7 +14,7 @@ Pattern Matching Coverage Checking.</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Checking and printing</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkSingle</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkMatches</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkGuardMatches</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">needToRunPmCheck</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">isMatchContextPmChecked</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isMatchContextPmChecked</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type and Term Equality Propagation]</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">addTyCsDs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addScrutTmCs</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">@@ -45,7 +45,7 @@ import GHC.Core.DataCon</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC46" 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="LC47" 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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<pre style="margin: 0;">-<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span> <span class="p">(</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsWrapper</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="nf" style="color: #900; font-weight: 600;"><span class="idiff">isIdHsWrapper</span></span><span class="idiff right"> </span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HsWrapper</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="nf" style="color: #900; font-weight: 600;"><span class="idiff right">isIdHsWrapper</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.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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50
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50
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="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;">dsExpr</span><span class="p">,</span> <span class="n" style="color: #333;">dsLExpr</span><span class="p">,</span> <span class="n" style="color: #333;">dsSyntaxExpr</span><span class="p">)</span></span>
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51
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51
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="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;">Binds</span> <span class="p">(</span><span class="n" style="color: #333;">dsHsWrapper</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">@@ -53,6 +53,7 @@ import GHC.HsToCore.Utils (selectMatchVar)</td>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Match.Literal</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">dsLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dsOverLit</span><span class="p">)</span></span>
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54
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.HsToCore.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;">+<span id="LC56" 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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56
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<pre style="margin: 0;"> <span id="LC57" 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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58
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>
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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.Core.Type</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1033,20 +1034,30 @@ Functions `addScrutTmCs' is responsible for generating</td>
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1033
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">these constraints.</span></span>
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1034
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1035
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="cd">-- | Locally update 'dsl_deltas' with the given action, but defer evaluation</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with 'unsafeInterleaveM' in order not to do unnecessary work.</span></span>
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1036
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Deltas</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;">Deltas</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="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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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getPmDeltas</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">ext</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">deltas</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="LC1038" class="line" lang="haskell"> <span class="n" style="color: #333;">inh</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">deltas</span></span>
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If adding a constraint would lead to a contradiction, don't add it.</span></span>
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1040
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<pre style="margin: 0;">-<span id="LC1040" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See @Note [Recovering from unsatisfiable pattern-matching constraints]@</span></span>
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for why this is done.</span></span>
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1042
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<pre style="margin: 0;">-<span id="LC1042" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">inh</span></span>
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1043
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="n" style="color: #333;">k</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">k</span></span>
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1045
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"></span>
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1046
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<pre style="margin: 0;">-<span id="LC1046" class="line" lang="haskell"><span class="cd">-- | Add in-scope type constraints</span></span>
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1047
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<pre style="margin: 0;">-<span id="LC1047" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCsDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</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="LC1048" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCsDs</span> <span class="n" style="color: #333;">ev_vars</span> <span class="o" style="font-weight: 600;">=</span></span>
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1049
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<pre style="margin: 0;">-<span id="LC1049" class="line" lang="haskell"> <span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getPmDeltas</span></span>
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unsafeInterleaveM</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"> <span class="n" style="color: #333;">deltas'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ext</span> <span class="n" style="color: #333;">deltas</span></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"> <span class="n" style="color: #333;">inh</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isInhabited</span> <span class="n" style="color: #333;">deltas'</span></span>
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If adding a constraint would lead to a contradiction, don't add it.</span></span>
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See @Note [Recovering from unsatisfiable pattern-matching constraints]@</span></span>
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for why this is done.</span></span>
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">inh</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">deltas'</span></span>
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">deltas</span></span>
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"> <span class="n" style="color: #333;">updPmDeltas</span> <span class="n" style="color: #333;">deltas'</span> <span class="n" style="color: #333;">k</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="cd">-- | Add in-scope type constraints if the coverage checker might run and then</span></span>
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1054
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- run the given action.</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCsDs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Origin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</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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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCsDs</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">ev_vars</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" 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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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"> <span class="n" style="color: #333;">applyWhen</span> <span class="p">(</span><span class="n" style="color: #333;">needToRunPmCheck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">origin</span><span class="p">)</span></span>
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1059
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">locallyExtendPmDelta</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">deltas</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPmCtsDeltas</span> <span class="n" style="color: #333;">deltas</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmTyCt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">ev_vars</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1062" class="line" lang="haskell"><span class="cd">-- | Add equalities for the scrutinee to the local 'DsM' environment when</span></span>
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checking a case expression:</span></span>
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<li id="46e7b59eca287d43c19d0d8902b41f5d04f0d268">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/de9fc995c2170bc34600ee3fc80393c67cfecad1...fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1#46e7b59eca287d43c19d0d8902b41f5d04f0d268"><strong>compiler/GHC/Tc/Types/Evidence.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">@@ -10,7 +10,7 @@ module GHC.Tc.Types.Evidence (</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;"><.></span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpTyApps</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpEvApps</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpEvVarApps</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpTyLams</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkWpLams</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpLet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpCastN</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkWpCastR</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">collectHsWrapBinders</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkWpFun</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">idHsWrapper</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIdHsWrapper</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isErasableHsWrapper</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprHsWrapper</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pprHsWrapper</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">hsWrapDictBinders</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Evidence bindings</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcEvBinds</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;">EvBindsVar</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">@@ -370,6 +370,27 @@ isErasableHsWrapper = go</td>
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370
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpTyApp</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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371
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpLet</span><span class="p">{}</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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372
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372
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">DictId</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Identifies the /lambda-bound/ dictionaries of an 'HsWrapper'. This is used</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (only) to allow the pattern-match overlap checker to know what Given</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;">-- dictionaries are in scope.</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;">--</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We specifically do not collect dictionaries bound in a 'WpLet'. These are</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- either superclasses of lambda-bound ones, or (extremely numerous) results of</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- binding Wanted dictionaries. We definitely don't want all those cluttering</span></span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- up the Given dictionaries for pattern-match overlap checking!</span></span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="n" style="color: #333;">hsWrapDictBinders</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">wrap</span></span>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" 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;">WpEvLam</span> <span class="n" style="color: #333;">dict_id</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">dict_id</span></span>
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385
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">w1</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">WpCompose</span><span class="p">`</span> <span class="n" style="color: #333;">w2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">w1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">w2</span></span>
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<pre style="margin: 0;">+<span id="LC386" 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;">WpFun</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">w</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">WpHole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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<pre style="margin: 0;">+<span id="LC388" 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;">WpCast</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" 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;">WpEvApp</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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390
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<pre style="margin: 0;">+<span id="LC390" 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;">WpTyLam</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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391
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<pre style="margin: 0;">+<span id="LC391" 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;">WpTyApp</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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392
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<pre style="margin: 0;">+<span id="LC392" 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;">WpLet</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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393
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"></span>
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373
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394
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"><span class="n" style="color: #333;">collectHsWrapBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">)</span></span>
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374
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395
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Collect the outer lambda binders of a HsWrapper,</span></span>
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375
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396
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- stopping as soon as you get to a non-lambda binder</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/de9fc995c2170bc34600ee3fc80393c67cfecad1...fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1#97ec106b0e095be48dc4424f08d16051fa3201f0"><strong>testsuite/tests/pmcheck/should_compile/T18049.hs</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE KindSignatures #-}</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" 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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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SFalse</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">~</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SFalse</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">STrue</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">SBool</span> <span class="n" style="color: #333;">b</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="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">x'</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x'</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- SFalse -> ()</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;">STrue</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span></pre>
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<li id="a52966ece03f9e76a93a2c4ea96b9fb25368723d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/de9fc995c2170bc34600ee3fc80393c67cfecad1...fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1#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">@@ -118,6 +118,8 @@ test('T17977', collect_compiler_stats('bytes allocated',10), compile,</td>
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118
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<pre style="margin: 0;"> <span id="LC118" 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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119
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17977b</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">10</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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120
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120
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<pre style="margin: 0;"> <span id="LC120" 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="LC121" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18049</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC122" 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="LC123" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Other tests</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">pmc001</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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