#6093: Kind polymorphism fails with recursive type definition using different
kind
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Reporter: Ashley Yakeley | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 7.4.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: GHC rejects valid
program
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by Ashley Yakeley):
This is from a real example and potentially quite a useful one. I want to
reify types, so I'm doing something a bit like this:
{{{
data Type t where
SimpleType :: IOWitness a -> Type a
ConstructedType :: Type f -> Type a -> Type (f a)
}}}
(There's more to it than that, I'm storing instance witnesses as well, but
you get the idea.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6093#comment:2>
GHC <http://www.haskell.org/ghc/>
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