#6093: Kind polymorphism fails with recursive type definition using different
kind
---------------------------------------+------------------------------------
Reporter: Ashley Yakeley | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type
checker)
Version: 7.4.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: GHC rejects valid program | Testcase:
Blockedby: | Blocking:
Related: |
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{{{
{-# LANGUAGE GADTs, PolyKinds #-}
module Bug where
data R t where
MkR :: R f -> R (f ())
}}}
results in
{{{
Bug.hs:4:26:
Kind mis-match
The first argument of `R' should have kind `* -> k0',
but `f ()' has kind `k0'
In the type `R (f ())'
In the definition of data constructor `MkR'
In the data type declaration for `R'
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6093>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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