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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/4aea0a72040e862ab518d911057905e8cf8d15fb">4aea0a72</a></strong>
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<span> by Vladislav Zavialov </span> <i> at 2023-06-07T12:06:46+02:00 </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;'>Invisible binders in type declarations (#22560)
This patch implements @k-binders introduced in GHC Proposal #425
and guarded behind the TypeAbstractions extension:
type D :: forall k j. k -> j -> Type
data D @k @j a b = ...
^^ ^^
To represent the new syntax, we modify LHsQTyVars as follows:
- hsq_explicit :: [LHsTyVarBndr () pass]
+ hsq_explicit :: [LHsTyVarBndr (HsBndrVis pass) pass]
HsBndrVis is a new data type that records the distinction between
type variable binders written with and without the @ sign:
data HsBndrVis pass
= HsBndrRequired
| HsBndrInvisible (LHsToken "@" pass)
The rest of the patch updates GHC, template-haskell, and haddock
to handle the new syntax.
Parser:
The PsErrUnexpectedTypeAppInDecl error message is removed.
The syntax it used to reject is now permitted.
Renamer:
The @ sign does not affect the scope of a binder, so the changes to
the renamer are minimal. See rnLHsTyVarBndrVisFlag.
Type checker:
There are three code paths that were updated to deal with the newly
introduced invisible type variable binders:
1. checking SAKS: see kcCheckDeclHeader_sig, matchUpSigWithDecl
2. checking CUSK: see kcCheckDeclHeader_cusk
3. inference: see kcInferDeclHeader, rejectInvisibleBinders
Helper functions bindExplicitTKBndrs_Q_Skol and bindExplicitTKBndrs_Q_Tv
are generalized to work with HsBndrVis.
Updates the haddock submodule.
Metric Increase:
MultiLayerModulesTH_OneShot
Co-authored-by: Simon Peyton Jones <simon.peytonjones@gmail.com>
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30 changed files:
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<a href="#06764eb0158306b83ab1998d18316392a51838c2">
compiler/GHC/Builtin/Names/TH.hs
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<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9">
compiler/GHC/Core/TyCon.hs
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<a href="#9f00edfedb0f969865b049a78de3866545b4a60b">
compiler/GHC/Hs/Instances.hs
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<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
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<a href="#3c19c0be465f9a28d7b69f89c55648080fcc37eb">
compiler/GHC/HsToCore/Quote.hs
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<a href="#4769efc0cb06e92bc7562e31984f6d7d91048e51">
compiler/GHC/Parser/Errors/Ppr.hs
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<a href="#6bd0eb7fd0a01f3d8cf2efe3f1d026d2145cf10b">
compiler/GHC/Parser/Errors/Types.hs
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<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
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<a href="#1dd9c7a6bbc222c976a6ec1c4b772232ae60f7e5">
compiler/GHC/Tc/Errors/Ppr.hs
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compiler/GHC/Tc/Errors/Types.hs
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<a href="#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7">
compiler/GHC/Tc/Gen/Splice.hs
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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<a href="#cf6d0ddc7f180b42a67a71e31b214052088685f7">
compiler/GHC/Tc/Zonk/TcType.hs
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<a href="#2eac51f9871ca0c0698aa1fc7f79c05ef8fc4a49">
compiler/GHC/ThToHs.hs
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compiler/GHC/Types/Error/Codes.hs
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<a href="#0d674271b5e602f8c38b813c8c42593afce96a1b">
compiler/GHC/Types/Hint.hs
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<a href="#5543c5c6c25dc2d751debfc3bc1be17365251351">
compiler/GHC/Types/Hint/Ppr.hs
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<a href="#ef5ad6f4dfc8fa107eace213eecba4bc1014ca57">
compiler/Language/Haskell/Syntax/Type.hs
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<a href="#56cab10ba9d31c526f47a492a4151a878077dc2d">
docs/users_guide/9.8.1-notes.rst
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<a href="#371a6fbdfe576b6a90fb252b0ef1a97c7488f006">
docs/users_guide/exts/primitives.rst
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<a href="#e1fda7a47737ee512bcbf1b5941aa3474719cae5">
docs/users_guide/exts/type_abstractions.rst
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<a href="#f2be3722dbfecb9150fcd7084cce2a871fb32d94">
libraries/ghci/GHCi/TH/Binary.hs
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<a href="#b1ae9d61e7dc1aafaeeab37b56c3a045e926a855">
libraries/template-haskell/Language/Haskell/TH.hs
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<a href="#556b3bb7c75dfe37155d079195cb9671e3061783">
libraries/template-haskell/Language/Haskell/TH/Lib.hs
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<a href="#97b63f699307e7a6d92425265508cfc9e963c336">
libraries/template-haskell/Language/Haskell/TH/Lib/Internal.hs
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<a href="#8e584d18427a4bfabb2a7d6fce6efcbc2afb0954">
libraries/template-haskell/Language/Haskell/TH/Ppr.hs
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<a href="#ed3c6537b674490396f9cab5cbb014ee54e71168">
libraries/template-haskell/Language/Haskell/TH/Syntax.hs
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