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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Marge Bot pushed to branch master at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1bf25c7d4829ec5823974af2e8ea3821d724f25">d1bf25c7</a></strong>
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<span> by Vladislav Zavialov </span> <i> at 2023-11-26T11:45:49-05:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Term variable capture (#23740)
This patch changes type variable lookup rules (lookupTypeOccRn) and
implicit quantification rules (filterInScope) so that variables bound
in the term namespace can be captured at the type level
{-# LANGUAGE RequiredTypeArguments #-}
f1 x = g1 @x -- `x` used in a type application
f2 x = g2 (undefined :: x) -- `x` used in a type annotation
f3 x = g3 (type x) -- `x` used in an embedded type
f4 x = ...
where g4 :: x -> x -- `x` used in a type signature
g4 = ...
This change alone does not allow us to accept examples shown above,
but at least it gets them past the renamer.
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30 changed files:
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compiler/GHC/Rename/Env.hs
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compiler/GHC/Rename/HsType.hs
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compiler/GHC/Rename/Module.hs
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compiler/GHC/Tc/Errors/Ppr.hs
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compiler/GHC/Tc/Errors/Types/PromotionErr.hs
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compiler/GHC/Tc/Gen/HsType.hs
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compiler/GHC/Tc/Gen/Splice.hs
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compiler/GHC/Tc/Utils/Env.hs
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testsuite/tests/diagnostic-codes/codes.stdout
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testsuite/tests/rename/should_compile/T22513g.hs
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