#3125: TcTyFuns.flattenType: unexpected PredType
-----------------------------+----------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.1 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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{{{
type family Garbage y
type instance Garbage y = [Num y => y]
}}}
yields
{{{
*Main> undefined :: Garbage Int
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for x86_64-unknown-linux):
TcTyFuns.flattenType: unexpected PredType
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
While its perfectly reasonable to die out on garbage like this, a less
apocalyptic error message might be nice.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3125>
GHC <http://www.haskell.org/ghc/>
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