#7368: kindFunResult panic in the
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Reporter: ChrisN | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 7.6.1
Keywords: Kinds, kindfunresult | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Compile-time crash
Difficulty: Unknown | Testcase:
typecheck/should_fail/T7368
Blockedby: | Blocking:
Related: |
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Comment(by arkeet):
I don't know if this should be a separate bug, but the following (ill-
typed) code produces the same error, both on 7.6.1 and on HEAD:
{{{
{-# LANGUAGE Rank2Types #-}
newtype Bad f = Bad (forall a. (f a -> a))
fun :: f (Bad f) -> Bad f
fun (Bad x) = Bad x
}}}
{{{
[1 of 1] Compiling Main ( bad.hs, bad.o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.7.20121127 for x86_64-unknown-linux):
kindFunResult ghc-prim:GHC.Prim.*{(w) tc 34d}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7368#comment:5>
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