#4356: type instance doesn't work when the type is (->)
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Reporter: sjoerd_visscher | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type checker)
Version: 7.1 | Keywords:
Testcase: | Blockedby:
Os: MacOS X | Blocking:
Architecture: x86_64 (amd64) | Failure: GHC rejects valid program
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This doesn't work in 7.0.0.20100924.
It works fine in 6.12.3.
{-# LANGUAGE TypeFamilies #-}
type family T t :: * -> * -> *
type instance T Bool = (->)
f :: T Bool Bool Bool
f = not
This is the error:
Couldn't match type `T Bool' with `(->)'
Expected type: T Bool Bool Bool
Actual type: Bool -> Bool
In the expression: not
In an equation for `f': f = not
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4356>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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