#5481: Associated type defaults + MultiParamTypeClasses error
----------------------------------------+-----------------------------------
Reporter: illissius | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.3
Resolution: fixed | Keywords:
Testcase: | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: GHC rejects valid program |
----------------------------------------+-----------------------------------
Comment(by simonpj):
But if you said
{{{
instance Foo [a] [b]
}}}
you'd generate the bogus instance
{{{
instance Foo [a] [b] where
type X [a] = [b]
type Y [b] = [a]
}}}
I think that defaults should always generate correct code. At lesat that's
the conservative choice.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5481#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
