#2503: Panic related to MPTC's and type equality
-----------------------+----------------------------------------------------
Reporter: Benja | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.2 | Severity: normal
Keywords: | Testcase:
Architecture: x86 | Os: Linux
-----------------------+----------------------------------------------------
The following code:
{{{
{-# OPTIONS_GHC -fglasgow-exts #-}
class Foo a b where
foo :: a
instance (a ~ ()) => Foo [a] b where
foo = undefined
main = print "hello"
}}}
gives this:
{{{
ghc-6.8.2: panic! (the 'impossible' happened)
(GHC version 6.8.2 for i386-unknown-linux):
nameModule $dFoo{v aqY}
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2503>
GHC <http://www.haskell.org/ghc/>
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