#2881: Basic Fibonacci function using Word causes ghci to panic. - 6.10.1
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Reporter: axman6 | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution:
Keywords: panic Word fibonacci | Testcase:
Os: Unknown/Multiple | Architecture: x86
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Changes (by axman6):
* summary: Basif Fibonacci function using Word causes ghci to panic. -
6.10.1 => Basic Fibonacci function using Word
causes ghci to panic. - 6.10.1
Comment:
from #ghc:
{{{
14:02 < mmorrow> weird:
14:02 < mmorrow> ghci> case undefined of (0::Word) -> undefined
14:02 < mmorrow> panics
14:02 < mmorrow> but
14:02 < mmorrow> ghci> case undefined of (0::Word32) -> undefined
14:02 < mmorrow> *** Exception: Prelude.undefined
14:02 < mmorrow> (and Word{8,16,32,64} all work)
14:03 < mmorrow> this works too
14:03 < mmorrow> case (0::Word) of _ -> undefined
[and]
14:03 < mmorrow> case (0::Word) of 0 -> undefined
14:05 < mmorrow> ghci> case 0 of (0::Word) -> undefined
14:05 < mmorrow> *** Exception: Prelude.undefined
14:05 < mmorrow> ghci> case undefined of (0::Word) -> undefined
14:05 < mmorrow> ghc: panic! (the 'impossible' happened)...
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2881#comment:1>
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