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<h3>
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><a href="https://gitlab.haskell.org/ghc/ghc/commit/effdd948056923f3bc03688c24d7e0339d6272f5">effdd948</a></strong>
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<span>by Andrew Martin</span>
<i>at 2019-06-14T14:48:13Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement the -XUnliftedNewtypes extension.
GHC Proposal: 0013-unlifted-newtypes.rst
Discussion: https://github.com/ghc-proposals/ghc-proposals/pull/98
Issues: #15219, #1311, #13595, #15883
Implementation Details:
Note [Implementation of UnliftedNewtypes]
Note [Unifying data family kinds]
Note [Compulsory newtype unfolding]
This patch introduces the -XUnliftedNewtypes extension. When this
extension is enabled, GHC drops the restriction that the field in
a newtype must be of kind (TYPE 'LiftedRep). This allows types
like Int# and ByteArray# to be used in a newtype. Additionally,
coerce is made levity-polymorphic so that it can be used with
newtypes over unlifted types.
The bulk of the changes are in TcTyClsDecls.hs. With -XUnliftedNewtypes,
getInitialKind is more liberal, introducing a unification variable to
return the kind (TYPE r0) rather than just returning (TYPE 'LiftedRep).
When kind-checking a data constructor with kcConDecl, we attempt to
unify the kind of a newtype with the kind of its field's type. When
typechecking a data declaration with tcTyClDecl, we again perform a
unification. See the implementation note for more on this.
Co-authored-by: Richard Eisenberg <rae@richarde.dev>
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compiler/basicTypes/Id.hs
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compiler/basicTypes/MkId.hs
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compiler/codeGen/StgCmmForeign.hs
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compiler/deSugar/DsExpr.hs
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compiler/hsSyn/HsTypes.hs
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compiler/main/DynFlags.hs
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compiler/main/TidyPgm.hs
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compiler/prelude/TysPrim.hs
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compiler/prelude/primops.txt.pp
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compiler/rename/RnSource.hs
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compiler/typecheck/TcErrors.hs
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compiler/typecheck/TcEvidence.hs
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compiler/typecheck/TcHsType.hs
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compiler/typecheck/TcInstDcls.hs
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compiler/typecheck/TcMType.hs
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compiler/typecheck/TcSimplify.hs
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compiler/typecheck/TcTyClsDecls.hs
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compiler/typecheck/TcTypeable.hs
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compiler/types/Coercion.hs
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compiler/types/Type.hs
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docs/users_guide/8.10.1-notes.rst
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libraries/base/Control/Category.hs
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libraries/base/Data/Coerce.hs
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libraries/base/Data/Type/Coercion.hs
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libraries/base/GHC/Base.hs
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libraries/base/changelog.md
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libraries/ghc-boot-th/GHC/LanguageExtensions/Type.hs
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libraries/ghc-prim/GHC/Types.hs
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testsuite/tests/codeGen/should_fail/T13233.stderr
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