#2334: panic using type families and type classes
---------------------------+------------------------------------------------
Reporter: pgavin | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.9
Severity: normal | Resolution:
Keywords: type families | Difficulty: Unknown
Testcase: | Architecture: x86
Os: MacOS X |
---------------------------+------------------------------------------------
Changes (by simonmar):
* difficulty: => Unknown
Old description:
> I got a panic while trying to compile some code using type families:
>
> ghc-6.9.20080528: panic! (the 'impossible' happened)
> (GHC version 6.9.20080528 for i386-apple-darwin):
> urk! lookup local fingerprint
>
> I can't post the code that caused that (yet) but when I was trying to
> distill it down to its essence for a bug report, I got a different panic:
>
> ghc-6.9.20080528: panic! (the 'impossible' happened)
> (GHC version 6.9.20080528 for i386-apple-darwin):
> Prelude.head: empty list
>
> I've attached the code that caused it. I know the code might not be 100%
> correct, and it's a bit long, but I think it might help some.
New description:
I got a panic while trying to compile some code using type families:
{{{
ghc-6.9.20080528: panic! (the 'impossible' happened)
(GHC version 6.9.20080528 for i386-apple-darwin):
urk! lookup local fingerprint
}}}
I can't post the code that caused that (yet) but when I was trying to
distill it down to its essence for a bug report, I got a different panic:
{{{
ghc-6.9.20080528: panic! (the 'impossible' happened)
(GHC version 6.9.20080528 for i386-apple-darwin):
Prelude.head: empty list
}}}
I've attached the code that caused it. I know the code might not be 100%
correct, and it's a bit long, but I think it might help some.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2334#comment:1>
GHC <http://www.haskell.org/ghc/>
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