#1123: Impredicativity bug: forall not hoisted properly
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Reporter: Ashley Yakeley <[EMAIL PROTECTED]> | Owner: simonpj
Type: bug | Status: new
Priority: normal | Milestone: 6.10 branch
Component: Compiler | Version: 6.6
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Unknown
Os: Unknown |
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Comment (by simonpj):
No, this is a different problem. The type sig for `runA2` says that the
argument must be polymorphic, but then you are matching against a
monomorphic pattern. This is sound -- the type signature is more
restrictive than the pattern -- but GHC doesn't currently support it,
because I've not found any convincing uses. What's wrong with
{{{
runA2 :: forall s A s -> ()
}}}
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1123#comment:8>
GHC <http://www.haskell.org/ghc/>
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