#2334: panic using type families and type classes
------------------------------+---------------------------------------------
Reporter: pgavin | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.9 | Severity: normal
Keywords: type families | Testcase:
Architecture: x86 | Os: MacOS X
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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>
GHC <http://www.haskell.org/ghc/>
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