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  • Glasgow Haskell Compiler
  • GHCGHC
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  • #12045

Closed
Open
Opened May 11, 2016 by Icelandjack@IcelandjackReporter

Visible kind application

I've wanted this for a while

ghci> :kind (:~:)
(:~:) :: k -> k -> Type
ghci> :kind (:~:) @(Type -> Type)
(:~:) @(Type -> Type) :: (Type -> Type) -> (Type -> Type) -> Type

ghci> :kind (:~:) @(Type -> Type) []
(:~:) @(Type -> Type) [] :: (Type -> Type) -> Type

ghci> :kind (:~:) @(Type -> Type) [] Maybe
(:~:) @(Type -> Type) [] Maybe :: Type

Working like

ghci> type Same k (a::k) (b::k) = a :~: b
ghci> :kind Same
Same :: forall k -> k -> k -> *
ghci> :kind Same (Type -> Type)
Same (Type -> Type) :: (Type -> Type) -> (Type -> Type) -> *
ghci> :kind Same (Type -> Type) []
Same (Type -> Type) [] :: (Type -> Type) -> *
ghci> :kind Same (Type -> Type) [] Maybe
Same (Type -> Type) [] Maybe :: *
Trac metadata
Trac field Value
Version 8.1
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
8.8.1
Milestone
8.8.1 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#12045