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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Andrei Borzenkov pushed to branch wip/sand-witch/modern-STV-extension-shuffling at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<ul>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0009b5ae5bab089a79499f6446a3afebf43d08ce">0009b5ae</a></strong>
<div>
<span> by Andrei Borzenkov </span> <i> at 2023-05-29T12:47:16+04:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.875rem; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>Fix -Wterm-variable-capture scope (#23434)
-Wterm-variable-capture wasn't accordant with type variable
scoping in associated types, in type classes. For example,
this code produced the warning:
k = 12
class C k a where
type AT a :: k -> Type
I solved this issue by reusing machinery of newTyVarNameRn function
that is accordand with associated types: it does lookup for each free type
variable when we are in the type class context. And in this patch I
use result of this work to make sure that -Wterm-variable-capture warns
only on implicitly quantified type variables.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47e341d524a104c6f81260bf478bbc4c9ec52a0">a47e341d</a></strong>
<div>
<span> by Andrei Borzenkov </span> <i> at 2023-05-29T15:00:08+04:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.875rem; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>Extension shuffling (#23291)
Where introduced 4 new extensions:
- PatternSignatures
- ExtendedForAllScope
- MethodTypeVariables
- ImplicitForAll
Tasks of ScopedTypeVariables extension were distributed between
PatternSignatures, ExtendedForAllScope and MethodTypeVariables according
to the proposal. Now ScopedTypeVaribles only implies these three exntesions.
Extension ImplicitForAll saves current behavior. NoImplicitForAll
disables implicit bounding of type variables in many contexts.
Was introduced one new warning option: -Wpattern-signature-binds
It warns when pattern signature binds into scope new type variable. For
example:
f (a :: t) = ...
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30 changed files:
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<a href="#e65e7bbfc24f8830a20082bfc50f6d16e613cbeb">
compiler/GHC/Driver/DynFlags.hs
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compiler/GHC/Driver/Flags.hs
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compiler/GHC/Driver/Session.hs
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compiler/GHC/Hs/Type.hs
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compiler/GHC/Rename/Bind.hs
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compiler/GHC/Rename/Expr.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/Deriv.hs
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compiler/GHC/Tc/Deriv/Generate.hs
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compiler/GHC/Tc/Errors/Ppr.hs
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compiler/GHC/Tc/Errors/Types.hs
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compiler/GHC/Types/Error/Codes.hs
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docs/users_guide/exts/implicit_forall.rst
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docs/users_guide/exts/scoped_type_variables.rst
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libraries/ghc-boot-th/GHC/LanguageExtensions/Type.hs
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testsuite/tests/driver/T4437.hs
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The diff was not included because it is too large.
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