ScopedTypeVariables & PolyKinds lead to weird error message
When I try to compile
{-# LANGUAGE ScopedTypeVariables, RankNTypes, PolyKinds #-}
module Bug where
import Data.Proxy
foo = (undefined :: Proxy a) :: forall a. Proxy a
I get
Bug.hs:7:27:
Kind variable ‘k’ used as a type
In an expression type signature: Proxy a
In the expression: (undefined :: Proxy a) :: forall a. Proxy a
In an equation for ‘foo’:
foo = (undefined :: Proxy a) :: forall a. Proxy a
This is all the more odd given that k
does not appear in my code!
This bug happens both in HEAD and in 7.8.1 RC 2.
Trac metadata
Trac field | Value |
---|---|
Version | 7.8.1-rc2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |