#7560: Panic in conflictInstErr when branched type family instances conflict
-------------------------------+--------------------------------------------
Reporter: goldfire | Owner: goldfire
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.7 | Keywords: TypeFamilies
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Compile-time crash | Blockedby:
Blocking: | Related:
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This code causes the panic:
{{{
{-# LANGUAGE TypeFamilies #-}
type family F a
type instance where
F Int = Int
F Bool = Bool
type instance where
F Int = Char
F Double = Double
}}}
Here is the output:
{{{
ghc: panic! (the 'impossible' happened)
(GHC version 7.7.20121221 for x86_64-apple-darwin):
conflictInstErr
<<details unavailable>>
}}}
Fix on the way...
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7560>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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