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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/f9f9f030d77ee6fb882897246a67b527937b8f66">f9f9f030</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-12-11T22:40:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arrows: correctly query arrow methods (#17423)
Consider the following code:
proc (C x y) -> ...
Before this patch, the evidence binding for the Arrow dictionary was
attached to the C pattern:
proc (C x y) { $dArrow = ... } -> ...
But then when we desugar this, we use arrow operations ("arr", ">>>"...)
specialised for this arrow:
let
arr_xy = arr $dArrow -- <-- Not in scope!
...
in
arr_xy (\(C x y) { $dArrow = ... } -> ...)
This patch allows arrow operations to be type-checked before the proc
itself, avoiding this issue.
Fix #17423
</pre>
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<h4>4 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d">
compiler/GHC/Tc/Gen/Arrow.hs
</a>
</li>
<li class="file-stats">
<a href="#361229cfd81ccff492eb2037e576f921518aa955">
testsuite/tests/gadt/T17423.hs
→
testsuite/tests/arrows/should_compile/T17423.hs
</a>
</li>
<li class="file-stats">
<a href="#36cee72f62d8c2fd50830864e0de2e2e864a7d2c">
testsuite/tests/arrows/should_compile/all.T
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</li>
<li class="file-stats">
<a href="#c68bb340f8f227ab4ac9922422ce0177433e1dfc">
testsuite/tests/gadt/all.T
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</ul>
<h4>Changes:</h4>
<li id="71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9f9f030d77ee6fb882897246a67b527937b8f66#71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d"><strong>compiler/GHC/Tc/Gen/Arrow.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">@@ -89,14 +89,17 @@ tcProc :: LPat GhcRn -> LHsCmdTop GhcRn -- proc pat -> expr</td>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span> <span class="c1" style="color: #998; font-style: italic;">-- Expected type of whole proc expression</span></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LPat</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmdTop</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="haskell"><span class="n" style="color: #333;">tcProc</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">cmd</span> <span class="n" style="color: #333;">exp_ty</span></span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newArrowScope</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expTypeToType</span> <span class="n" style="color: #333;">exp_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- no higher-rank stuff with arrows</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"><span class="n" style="color: #333;">tcProc</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">cmd</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsCmdTop</span> <span class="n" style="color: #333;">names</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span> <span class="n" style="color: #333;">exp_ty</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expTypeToType</span> <span class="n" style="color: #333;">exp_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- no higher-rank stuff with arrows</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">exp_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchExpectedAppTy</span> <span class="n" style="color: #333;">exp_ty</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">arr_ty</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchExpectedAppTy</span> <span class="n" style="color: #333;">exp_ty1</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- start with the names as they are used to desugar the proc itself</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #17423</span></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">names'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">tcSyntaxName</span> <span class="kt" style="color: #458; font-weight: 600;">ProcOrigin</span> <span class="n" style="color: #333;">arr_ty</span><span class="p">)</span> <span class="n" style="color: #333;">names</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">cmd_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CmdEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">cmd_arr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arr_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">cmd'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckPat</span> <span class="kt" style="color: #458; font-weight: 600;">ProcExpr</span> <span class="n" style="color: #333;">pat</span> <span class="p">(</span><span class="n" style="color: #333;">unrestricted</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCmdTop</span> <span class="n" style="color: #333;">cmd_env</span> <span class="n" style="color: #333;">cmd</span> <span class="p">(</span><span class="n" style="color: #333;">unitTy</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">cmd'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newArrowScope</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcCheckPat</span> <span class="kt" style="color: #458; font-weight: 600;">ProcExpr</span> <span class="n" style="color: #333;">pat</span> <span class="p">(</span><span class="n" style="color: #333;">unrestricted</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcCmdTop</span> <span class="n" style="color: #333;">cmd_env</span> <span class="n" style="color: #333;">names'</span> <span class="n" style="color: #333;">cmd</span> <span class="p">(</span><span class="n" style="color: #333;">unitTy</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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103
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">res_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTransCo</span> <span class="n" style="color: #333;">co</span></span>
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101
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTcAppCo</span> <span class="n" style="color: #333;">co1</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">res_ty</span><span class="p">))</span></span>
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102
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">cmd'</span><span class="p">,</span> <span class="n" style="color: #333;">res_co</span><span class="p">)</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">@@ -115,7 +118,7 @@ type CmdArgType = TcTauType -- carg_type, a nested tuple</td>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CmdEnv</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CmdEnv</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"> <span class="n" style="color: #333;">cmd_arr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">a</span>rrow type constructor, of kind *->*->*</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"> <span class="n" style="color: #333;">cmd_arr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">^ A</span>rrow type constructor, of kind *->*->*</span></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"><span class="n" style="color: #333;">mkCmdArrTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTauType</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">@@ -123,15 +126,15 @@ mkCmdArrTy env t1 t2 = mkAppTys (cmd_arr env) [t1, t2]</td>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC127" 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="LC128" class="line" lang="haskell"><span class="n" style="color: #333;">tcCmdTop</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmdEnv</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmdSyntaxTable</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type-checked Arrow class methods (arr, (>>>), ...)</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmdTop</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmdType</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsCmdTop</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">tcCmdTop</span> <span class="n" style="color: #333;">env</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">L</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsCmdTop</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">names</span> <span class="n" style="color: #333;">cmd</span><span class="p">))</span> <span class="n" style="color: #333;">cmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">cmd_stk</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">tcCmdTop</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;"><span class="idiff left">names</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">L</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsCmdTop</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">_</span>names</span> <span class="n" style="color: #333;">cmd</span><span class="p">))</span> <span class="n" style="color: #333;">cmd_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">cmd_stk</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cmd'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">cmd</span> <span class="n" style="color: #333;">cmd_ty</span></span>
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">names'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">tcSyntaxName</span> <span class="kt" style="color: #458; font-weight: 600;">ProcOrigin</span> <span class="p">(</span><span class="n" style="color: #333;">cmd_arr</span> <span class="n" style="color: #333;">env</span><span class="p">))</span> <span class="n" style="color: #333;">names</span></span>
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134
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</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="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdTop</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmdTopTc</span> <span class="n" style="color: #333;">cmd_stk</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">names'</span><span class="p">)</span> <span class="n" style="color: #333;">cmd'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cmd'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCmd</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">cmd</span> <span class="n" style="color: #333;">cmd_ty</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdTop</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CmdTopTc</span> <span class="n" style="color: #333;">cmd_stk</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="n" style="color: #333;">cmd'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"><span class="n" style="color: #333;">tcCmd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CmdEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmd</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CmdType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsCmd</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</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">@@ -319,12 +322,13 @@ tc_cmd env cmd@(HsCmdArrForm x expr f fixity cmd_args) (cmd_stk, res_ty)</td>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_cmd_arg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsCmdTop</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsCmdTop</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_cmd_arg</span> <span class="n" style="color: #333;">cmd</span></span>
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_cmd_arg</span> <span class="n" style="color: #333;">cmd</span><span class="o" style="font-weight: 600;"><span class="idiff left">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">L</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsCmdTop</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">names</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;"> <span id="LC326" 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;">arr_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFlexiTyVarTy</span> <span class="n" style="color: #333;">arrowTyConKind</span></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stk_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFlexiTyVarTy</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFlexiTyVarTy</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">names'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">tcSyntaxName</span> <span class="kt" style="color: #458; font-weight: 600;">ProcOrigin</span> <span class="n" style="color: #333;">arr_ty</span><span class="p">)</span> <span class="n" style="color: #333;">names</span></span>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">cmd_arr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arr_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cmd'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCmdTop</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;">cmd</span> <span class="p">(</span><span class="n" style="color: #333;">stk_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cmd'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCmdTop</span> <span class="n" style="color: #333;">env'</span> <span class="n" style="color: #333;"><span class="idiff left">names'</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">cmd</span> <span class="p">(</span><span class="n" style="color: #333;">stk_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC332" 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;">cmd'</span><span class="p">,</span> <span class="n" style="color: #333;">mkCmdArrTy</span> <span class="n" style="color: #333;">env'</span> <span class="p">(</span><span class="n" style="color: #333;">mkPairTy</span> <span class="n" style="color: #333;">alphaTy</span> <span class="n" style="color: #333;">stk_ty</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9f9f030d77ee6fb882897246a67b527937b8f66#361229cfd81ccff492eb2037e576f921518aa955"><strong>testsuite/tests/gadt/T17423.hs</strong>
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<strong>testsuite/tests/arrows/should_compile/T17423.hs</strong>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9f9f030d77ee6fb882897246a67b527937b8f66#36cee72f62d8c2fd50830864e0de2e2e864a7d2c"><strong>testsuite/tests/arrows/should_compile/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="16" 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="16" 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">@@ -16,3 +16,4 @@ test('T5283', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T5267</span><span class="p">',</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">5267</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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17
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17
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T5022</span><span class="p">',</span> <span class="nv" style="color: #008080;">normalise_fun</span><span class="p">(</span><span class="nv" style="color: #008080;">normalise_errmsg</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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18
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T5333</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17423</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f9f9f030d77ee6fb882897246a67b527937b8f66#c68bb340f8f227ab4ac9922422ce0177433e1dfc"><strong>testsuite/tests/gadt/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="119" 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="119" 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">@@ -119,6 +119,5 @@ test('T14808', normal, compile, [''])</td>
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119
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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;">T15009</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15558</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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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;">T16427</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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122
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17423</span><span class="p">',</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">17423</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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122
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18191</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">SynDataRec</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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