Bugs item #1175398, was opened at 2005-04-02 15:18
Message generated for change (Comment added) made by simonpj
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=108032&aid=1175398&group_id=8032
Category: Compiler
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: buggy class causes unifyTauTyLists mismatch
Initial Comment:
Obtained error in GHC:
Compiling Main ( test.hs, interpreted )
ghc.exe: panic! (the `impossible' happened, GHC version
6.4):
Unify.unifyTauTyLists: mismatched type lists!
Please report it as a compiler bug to
[email protected],
or http://sourceforge.net/projects/ghc/.
when :load called on buggy code:
class Foo f where
baa :: f a -> f
instance Foo Maybe where
baa z = z
On the other hand, Hugs identifies an error with an
"Illegal type in constructor application".
----------------------------------------------------------------------
>Comment By: Simon Peyton Jones (simonpj)
Date: 2005-04-04 12:30
Message:
Logged In: YES
user_id=50165
Already fixed in the STABLE branch (and HEAD). Thanks for
the report though.
----------------------------------------------------------------------
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=108032&aid=1175398&group_id=8032
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