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Diffstat (limited to 'docs/users_guide/8.10.1-notes.rst')
| -rw-r--r-- | docs/users_guide/8.10.1-notes.rst | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/users_guide/8.10.1-notes.rst b/docs/users_guide/8.10.1-notes.rst index e8316d7059..907f7e288b 100644 --- a/docs/users_guide/8.10.1-notes.rst +++ b/docs/users_guide/8.10.1-notes.rst @@ -46,6 +46,20 @@ Language type T = Just (Nothing :: Maybe a) -- no longer accepted type T = Just Nothing :: Maybe (Maybe a) -- still accepted +- A new extension :extension:`StandaloneKindSignatures` allows one to explicitly + specify the kind of a type constructor, as proposed in `GHC proposal #54 + <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0054-kind-signatures.rst>`__: :: + + type TypeRep :: forall k. k -> Type + data TypeRep a where + TyInt :: TypeRep Int + TyMaybe :: TypeRep Maybe + TyApp :: TypeRep a -> TypeRep b -> TypeRep (a b) + + Analogous to function type signatures, a :ref:`standalone kind signature + <standalone-kind-signatures>` enables polymorphic recursion. This feature is + a replacement for :extension:`CUSKs`. + - GHC now parses visible, dependent quantifiers (as proposed in `GHC proposal 35 <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0035-forall-arrow.rst>`__), |