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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Andrei Borzenkov pushed to branch wip/sand-witch/types-in-terms 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: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/568c8bfc2e48b2c80ee4b15c7cc698e1b27145a7">568c8bfc</a></strong>
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<span> by Andrei Borzenkov </span> <i> at 2024-07-31T16:16:44+04:00 </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;'>Type syntax in expressions (24159, 24572, 24226)
This patch extends the grammar of expressions with syntax that is
typically found only in types:
* function types (a -> b), (a ->. b), (a %m -> b)
* constrained types (ctx => t)
* forall-quantification (forall tvs. t)
The new forms are guarded behind the RequiredTypeArguments extension,
as specified in GHC Proposal #281. Examples:
{-# LANGUAGE RequiredTypeArguments #-}
e1 = f (Int -> String) -- function type
e2 = f (Int %1 -> String) -- linear function type
e3 = f (forall a. Bounded a => a) -- forall type, constraint
The GHC AST and the TH AST have been extended as follows:
syntax | HsExpr | TH.Exp
---------------+----------+--------------
a -> b | HsFunArr | ConE (->)
a %m -> b | HsFunArr | ConE FUN
ctx => t | HsQual | ConstrainedE
forall a. t | HsForAll | ForallE
forall a -> t | HsForAll | ForallVisE
Additionally, a new warning flag -Wview-pattern-signatures has been
introduced to aid with migration to the new precedence of (e -> p :: t).
Co-authored-by: Vladislav Zavialov <vlad.z.4096@gmail.com>
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30 changed files:
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compiler/GHC/Builtin/Names/TH.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/Expr.hs
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compiler/GHC/Hs/Instances.hs
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compiler/GHC/Hs/Pat.hs
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compiler/GHC/Hs/Syn/Type.hs
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compiler/GHC/Hs/Type.hs
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compiler/GHC/HsToCore/Expr.hs
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compiler/GHC/HsToCore/Quote.hs
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compiler/GHC/HsToCore/Ticks.hs
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compiler/GHC/Iface/Ext/Ast.hs
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compiler/GHC/Parser.y
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compiler/GHC/Parser/Annotation.hs
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compiler/GHC/Parser/Errors/Ppr.hs
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compiler/GHC/Parser/Errors/Types.hs
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compiler/GHC/Parser/Lexer.x
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compiler/GHC/Parser/PostProcess.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/Tc/Errors/Ppr.hs
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compiler/GHC/Tc/Errors/Types.hs
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compiler/GHC/Tc/Gen/App.hs
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compiler/GHC/Tc/Gen/Expr.hs
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compiler/GHC/Tc/Types/Origin.hs
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compiler/GHC/Tc/Zonk/Type.hs
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compiler/GHC/ThToHs.hs
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compiler/GHC/Types/Error/Codes.hs
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compiler/GHC/Types/Hint.hs
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compiler/GHC/Types/Hint/Ppr.hs
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