Greetings,
I encountered the same problem and tracked it to
ghc/compiler/simplCore/Simplify.lhs, line 1504:
... coreRefineTys tvs' (error urk) ...
and
ghc/compiler/types/Unify.lhs, line 209:
... coreRefineTys ex_tvs subst@(TvSubst in_scope orig_env) ...
which performs a strict pattern match on
! (the `impossible' happened,GHC version
6.3): urk
|
| Greetings,
|
| I encountered the same problem and tracked it to
| ghc/compiler/simplCore/Simplify.lhs, line 1504:
| ... coreRefineTys tvs' (error urk) ...
| and
| ghc/compiler/types/Unify.lhs, line 209:
| ... coreRefineTys ex_tvs subst@(TvSubst