[ ghc-Bugs-1290999 ] panic:Unify.unifyTauTyLists

Bugs item #1290999, was opened at 2005-09-14 15:23
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Category: Compiler (Type checker)
Group: 6.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Volker Stolz (volkersf)
Assigned to: Nobody/Anonymous (nobody)
Summary: panic:Unify.unifyTauTyLists

Initial Comment:
The attached sample program triggers a panic because I forgot to 
pass the type argument in the recursive algebraic datatype 
construction. The commented line is correct.
GHC should not panic but instead provide a helpful error message.
(Unluckily, I won't be able to test this with -HEAD atm)

Compiling Main             ( bugs.hs, interpreted )
ghc-6.4: panic! (the `impossible' happened, GHC version 6.4):
        Unify.unifyTauTyLists: mismatched type lists!


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