#1723: type unsafety with type family + GADT
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Reporter: [EMAIL PROTECTED] | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (Type checker) | Version: 6.8
Severity: major | Keywords:
Difficulty: Unknown | Os: Unknown
Testcase: | Architecture: Unknown
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Here's ''unsafeCoerce'':
{{{
type family Const a
type instance Const a = ()
data T a where T :: a -> T (Const a)
coerce :: forall a b . a -> b
coerce x = case T x :: T (Const b) of
T y -> y
}}}
Tested with GHC 6.9.20070918
Maybe, see also #345
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1723>
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