#1730: type families GHC "impossible happened"
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.8
Severity: normal | Resolution:
Keywords: type families panic | Difficulty: Unknown
Os: Unknown | Testcase:
Architecture: Unknown |
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Comment (by guest):
Oh, and a slightly older build produces the following error on the same
file:
{{{
$ ghci Foldable.hs
GHCi, version 6.8.0.20070919: http://www.haskell.org/ghc/ :? for help
Loading package base ... linking ... done.
[1 of 1] Compiling Data.Collections.Foldable ( Foldable.hs, interpreted )
Foldable.hs:131:10:
Couldn't match expected type `FoldElem t'
against inferred type `FoldElem t'
Expected type: Maybe (FoldElem t)
-> FoldElem t
-> Maybe (FoldElem t)
Inferred type: Maybe (FoldElem t)
-> FoldElem t
-> Maybe (FoldElem t)
In the first argument of `foldl', namely `mf'
In the second argument of `fromMaybe', namely
`(foldl mf Nothing xs)'
Failed, modules loaded: none.
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1730>
GHC <http://www.haskell.org/ghc/>
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