#1287: SPECIALIZE causes panic
---------------------------------+------------------------------------------
Reporter: [EMAIL PROTECTED] | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.6
Severity: normal | Keywords: panic, SPECIALIZE
Difficulty: Unknown | Testcase:
Architecture: Unknown | Os: Unknown
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the following code snippet makes GHC (6.6) panic:
{{{
delta' :: Eq a => a -> a -> b -> b -> b
delta' x y e f = if (x==y) then f else e
{-# SPECIALIZE delta' :: Num b => Int -> Int -> b -> b -> b #-}
delta :: (Eq a, Num b) => a -> a -> b
delta x y = delta' x y 0 1
{-# SPECIALIZE delta :: Num b => Int -> Int -> b #-}
}}}
the reply from GHC:
{{{
ghc-6.6: panic! (the 'impossible' happened)
(GHC version 6.6 for i386-apple-darwin):
Template variable unbound in rewrite rule $dNum{v a1bL} [lid]
}}}
it does not panic without the SPECIALIZE pragmas.
the version used is GHC 6.6, i386-apple-darwin.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1287>
GHC <http://www.haskell.org/ghc/>
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