#5935: Failure to resolve AnyK
---------------------------------------+------------------------------------
Reporter: goldfire | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type
checker)
Version: 7.4.1 | Keywords: DataKinds PolyKinds
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: GHC rejects valid program | Testcase:
Blockedby: | Blocking:
Related: |
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Consider the following code:
{{{
{-# LANGUAGE PolyKinds,
GADTs,
DataKinds,
KindSignatures
#-}
data SList a where
SNil :: SList '[]
x :: SList ('[] :: [Bool])
x = SNil
}}}
Compiling this code causes GHC to emit an error saying that {{{AnyK}}}
cannot be unified with {{{Bool}}}. It seems that {{{AnyK}}} is a
placeholder for an undetermined kind and that it should unify with any
well-formed kind.
As a much smaller issue, the error emitted speaks about "types" where it
means "kinds".
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5935>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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