#1988: 6.8.2 panics in nameModule with -O2
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.8.2
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: x86 | Os: MacOS X
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The attached file makes GHC 6.8.2 panic:
{{{
$ ghc-6.8.2 -fforce-recomp -O2 -c PPrCF.hs
ghc-6.8.2: panic! (the 'impossible' happened)
(GHC version 6.8.2 for i386-apple-darwin):
nameModule $wprCFTree{v sdg}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
It only happens with -O2:
{{{
$ ghc-6.8.2 -fforce-recomp -O1 -c PPrCF.hs
}}}
And only with 6.8.2:
{{{
$ ghc-6.8.1 -fforce-recomp -O2 -c PPrCF.hs
$ ghc-6.6.1 -fforce-recomp -O2 -c PPrCF.hs
}}}
-dcore-lint gives no additional information.
Adding a NOINLINE pragma for prCFTree makes the panic go away.
This problem and the NOINLINE work-around was found by Jean-Philippe
Bernardy in GF.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1988>
GHC <http://www.haskell.org/ghc/>
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