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<h3>
Ryan Scott pushed to branch wip/simply-bind-tyvars
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c">0e30ccaf</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-05-31T11:22:31-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use "rewrite rule" instead of "transformation rule" consistently
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<h4>15 changed files:</h4>
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<a href="#182d6a315e784018aa9c8b2ad736036b97bd5d48">
compiler/GHC/Core.hs
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<li class="file-stats">
<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3">
compiler/GHC/Core/Opt/Simplify.hs
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<li class="file-stats">
<a href="#d01de95d8c71d4dec6a9a59146186e29a5b3fd38">
compiler/GHC/Core/Rules.hs
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<a href="#ff068514f65150b5ec069a421b0223fe35f41569">
compiler/GHC/Driver/Types.hs
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<a href="#75bfcd03f3ba9315d33104fcb0424c6bfeb4e334">
compiler/GHC/Hs/Decls.hs
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<a href="#dd79b5199bc3b425c4536c633b39006df111a7ef">
compiler/GHC/HsToCore.hs
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<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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<a href="#939d24c1002dc322659c1f67c9f3d2db2ae31dd4">
compiler/GHC/Rename/Utils.hs
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<a href="#04338da99bccd89402218ca19c5724762f0fe641">
compiler/GHC/Tc/Gen/Rule.hs
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<a href="#bda6fd73ee46adb428d2f370a800d75d8870285b">
testsuite/tests/dependent/should_fail/T16326_Fail10.stderr
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<a href="#b15fb85962935af1b7fb83df87f475d0a063b675">
testsuite/tests/rename/should_compile/ExplicitForAllRules1.stderr
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<a href="#b55d19bf4a3da298b91d9937ce810a66b28696bf">
testsuite/tests/safeHaskell/ghci/p14.stderr
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<a href="#d8ffdc8dc2a88f5597df2257cd4ca89f8390d870">
testsuite/tests/typecheck/should_compile/T10072.stderr
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<a href="#b90469d42dc3fbd91171a499f33a5241c3c1bf87">
testsuite/tests/typecheck/should_fail/T5853.stderr
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<h4>Changes:</h4>
<li id="182d6a315e784018aa9c8b2ad736036b97bd5d48">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#182d6a315e784018aa9c8b2ad736036b97bd5d48"><strong>compiler/GHC/Core.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">@@ -1291,7 +1291,7 @@ Orphan-hood is computed</td>
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<pre style="margin: 0;"> <span id="LC1291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC1292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC1293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC1294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection{<span class="idiff left right">Transformation</span> rules}</span></span>
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<pre style="margin: 0;">+<span id="LC1294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection{<span class="idiff left right">Rewrite</span> rules}</span></span>
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<pre style="margin: 0;"> <span id="LC1295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC1296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC1297" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#36a42448a83a9d1f6df8475f03ead2eed199dd8e"><strong>compiler/GHC/Core/Lint.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">@@ -467,7 +467,7 @@ lintCoreBindings dflags pass local_in_scope binds</td>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="n" style="color: #333;">all_pairs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flattenBinds</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Put all the top-level binders in scope at the start</span></span>
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<pre style="margin: 0;">-<span id="LC470" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is because <span class="idiff left right">transformation</span> rules can bring something</span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is because <span class="idiff left right">rewrite</span> rules can bring something</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- into use 'unexpectedly'; see Note [Glomming] in OccurAnal</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"> <span class="n" style="color: #333;">binders</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">all_pairs</span></span>
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#f168a93cde5e2aec2441d6331dfe500172df4af3"><strong>compiler/GHC/Core/Opt/Simplify.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">@@ -170,7 +170,7 @@ simplTopBinds :: SimplEnv -> [InBind] -> SimplM (SimplFloats, SimplEnv)</td>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The big picture]</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">simplTopBinds</span> <span class="n" style="color: #333;">env0</span> <span class="n" style="color: #333;">binds0</span></span>
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<pre style="margin: 0;"> <span id="LC172" 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="c1" style="color: #998; font-style: italic;">-- Put all the top-level binders into scope at the start</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so that if a <span class="idiff left right">transformation</span> rule has unexpectedly brought</span></span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so that if a <span class="idiff left right">rewrite</span> rule has unexpectedly brought</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- anything into scope, then we don't get a complaint about that.</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's rather as if the top-level binders were imported.</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See note [Glomming] in OccurAnal.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#d01de95d8c71d4dec6a9a59146186e29a5b3fd38"><strong>compiler/GHC/Core/Rules.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(c) The GRASP/AQUA Project, Glasgow University, 1992-1998</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\section[CoreRules]{<span class="idiff left right">Transformation</span> rules}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\section[CoreRules]{<span class="idiff left right">Rewrite</span> rules}</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#ff068514f65150b5ec069a421b0223fe35f41569"><strong>compiler/GHC/Driver/Types.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2486,7 +2486,7 @@ lookupFixity env n = case lookupNameEnv env n of</td>
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<pre style="margin: 0;"> <span id="LC2486" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * An instance declaration in a module other than the definition</span></span>
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<pre style="margin: 0;"> <span id="LC2487" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- module for one of the type constructors or classes in the instance head</span></span>
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<pre style="margin: 0;"> <span id="LC2488" 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="LC2489" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * A <span class="idiff left right">transformation</span> rule in a module other than the one defining</span></span>
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<pre style="margin: 0;">+<span id="LC2489" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * A <span class="idiff left right">rewrite</span> rule in a module other than the one defining</span></span>
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<pre style="margin: 0;"> <span id="LC2490" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the function in the head of the rule</span></span>
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<pre style="margin: 0;"> <span id="LC2491" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2492
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<pre style="margin: 0;"> <span id="LC2492" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">WhetherHasOrphans</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#75bfcd03f3ba9315d33104fcb0424c6bfeb4e334"><strong>compiler/GHC/Hs/Decls.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">@@ -2184,7 +2184,7 @@ instance Outputable ForeignExport where</td>
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2184
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<pre style="margin: 0;"> <span id="LC2184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2185
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2185
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<pre style="margin: 0;"> <span id="LC2185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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2186
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<pre style="margin: 0;"> <span id="LC2186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC2187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection{<span class="idiff left right">Transformation</span> rules}</span></span>
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<pre style="margin: 0;">+<span id="LC2187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection{<span class="idiff left right">Rewrite</span> rules}</span></span>
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<pre style="margin: 0;"> <span id="LC2188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC2189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC2190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#dd79b5199bc3b425c4536c633b39006df111a7ef"><strong>compiler/GHC/HsToCore.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">@@ -354,7 +354,7 @@ to the binders in the top-level bindings</td>
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Reason</span></span>
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - It makes the rules easier to look up</span></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - It means that <span class="idiff left right">transformation</span> rules and specialisations for</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - It means that <span class="idiff left right">rewrite</span> rules and specialisations for</span></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> locally defined Ids are handled uniformly</span></span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - It keeps alive things that are referred to only from a rule</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (the occurrence analyser knows about rules attached to Ids)</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">@@ -368,7 +368,7 @@ Reason</td>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Desugaring <span class="idiff left right">transformation</span> rules</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Desugaring <span class="idiff left right">rewrite</span> rules</span></span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a"><strong>compiler/GHC/Rename/Module.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">@@ -1068,7 +1068,7 @@ bindRuleTyVars _ _ thing_inside = thing_inside Nothing</td>
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1069
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Rule LHS validity checking]</span></span>
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Check the shape of a <span class="idiff left right">transformation</span> rule LHS. Currently we only allow</span></span>
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Check the shape of a <span class="idiff left right">rewrite</span> rule LHS. Currently we only allow</span></span>
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">LHSs of the form @(f e1 .. en)@, where @f@ is not one of the</span></span>
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">@forall@'d variables.</span></span>
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#939d24c1002dc322659c1f67c9f3d2db2ae31dd4"><strong>compiler/GHC/Rename/Utils.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">@@ -495,7 +495,7 @@ pprHsDocContext PatCtx = text "a pattern type-signature"</td>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="kt" style="color: #458; font-weight: 600;">SpecInstSigCtx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a SPECIALISE instance pragma"</span></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="kt" style="color: #458; font-weight: 600;">DefaultDeclCtx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a `default' declaration"</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a deriving declaration"</span></span>
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<pre style="margin: 0;">-<span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleCtx</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"the <span class="idiff left">transformation rule"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ftext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">name</span></span></span>
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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuleCtx</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"the <span class="idiff left">rewrite rule"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">doubleQuotes</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ftext</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">name</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyDataCtx</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"the data type declaration for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamPatCtx</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a type pattern of family instance for"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"><span class="n" style="color: #333;">pprHsDocContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtx</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"the declaration for type synonym"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#04338da99bccd89402218ca19c5724762f0fe641"><strong>compiler/GHC/Tc/Gen/Rule.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">@@ -7,7 +7,7 @@</td>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"><span class="cd">-- | Typechecking <span class="idiff left right">transformation</span> rules</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="cd">-- | Typechecking <span class="idiff left right">rewrite</span> rules</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Rule</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcRules</span> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</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">@@ -239,7 +239,7 @@ tcRuleTmBndrs (L _ (RuleBndrSig _ (L _ name) rn_ty) : rule_bndrs)</td>
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<pre style="margin: 0;"> <span id="LC239" 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;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">tmvars</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell"><span class="n" style="color: #333;">ruleCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="n" style="color: #333;">ruleCtxt</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When checking the <span class="idiff left right">transformation</span> rule"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="n" style="color: #333;">ruleCtxt</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When checking the <span class="idiff left right">rewrite</span> rule"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"> <span class="n" style="color: #333;">doubleQuotes</span> <span class="p">(</span><span class="n" style="color: #333;">ftext</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC245" 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">@@ -4,4 +4,4 @@ T16326_Fail10.hs:12:18: error:</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> forall a -> a -> a</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> (GHC does not yet support this)</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In a RULE for ‘x’: forall a -> a -> a</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> When checking the <span class="idiff left right">transformation</span> rule "flurmp"</span></pre>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> When checking the <span class="idiff left right">rewrite</span> rule "flurmp"</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#b15fb85962935af1b7fb83df87f475d0a063b675"><strong>testsuite/tests/rename/should_compile/ExplicitForAllRules1.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">ExplicitForAllRules1.hs:49:31: warning: [-Wunused-foralls (in -Wextra)]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Unused quantified type variable ‘b’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> In the <span class="idiff left right">transformation rule example7</span></span></pre>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In the <span class="idiff left right">rewrite rule "example7"</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#b55d19bf4a3da298b91d9937ce810a66b28696bf"><strong>testsuite/tests/safeHaskell/ghci/p14.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext"><interactive>:9:25: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> No instance for (Num a) arising from a use of ‘f’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Possible fix: add (Num a) to the context of the RULE "id/Int"</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the expression: f</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right">When checking the transformation</span> rule "id/Int"</span></pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> <span class="idiff left right">• </span>No instance for (Num a) arising from a use of ‘f’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right"> </span>Possible fix: add (Num a) to the context of the RULE "id/Int"</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> <span class="idiff left right">• </span>In the expression: f</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> <span class="idiff left right"> When checking the rewrite</span> rule "id/Int"</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#d8ffdc8dc2a88f5597df2257cd4ca89f8390d870"><strong>testsuite/tests/typecheck/should_compile/T10072.stderr</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">@@ -7,4 +7,4 @@ T10072.hs:3:31: error:</td>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> To use the inferred type, enable PartialTypeSignatures</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> • In the type ‘a -> _’</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> In a RULE for ‘f’: a -> _</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> When checking the <span class="idiff left right">transformation</span> rule "map/empty"</span></pre>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> When checking the <span class="idiff left right">rewrite</span> rule "map/empty"</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e30ccaf1babce0ac7797252a004820ea95c803c#b90469d42dc3fbd91171a499f33a5241c3c1bf87"><strong>testsuite/tests/typecheck/should_fail/T5853.stderr</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">@@ -9,7 +9,7 @@ T5853.hs:15:52: error:</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> bound by the RULE "map/map" at T5853.hs:15:2-57</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> NB: ‘Subst’ is a non-injective type family</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> • In the expression: (f . g) <$> xs</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> When checking the <span class="idiff left right">transformation</span> rule "map/map"</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> When checking the <span class="idiff left right">rewrite</span> rule "map/map"</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> f :: Elem fa -> b (bound at T5853.hs:15:19)</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> g :: a -> Elem fa (bound at T5853.hs:15:21)</span>
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