GHC panic
GHC crashed with the following output, but I don't know what this is about. Do you need other kind of information?
ghc output:
ghc-6.8.1: panic! (the 'impossible' happened)
(GHC version 6.8.1 for i386-apple-darwin):
tcIfaceGlobal (local): not found:
main:Eval.$fx2{v r4H}
[(r4J, Class `main:Eval.JustReturn{tc r4J}'),
(r4L, Type constructor `main:Eval.:Co:TJustReturn{tc r4L}'),
(r4M, Type constructor `main:Eval.:TJustReturn{tc r4M}'),
(r4N, Data constructor `main:Eval.:DJustReturn{d r4N}'),
(r4O, Identifier `main:Eval.:DJustReturn{v r4O}'),
(r4P, Identifier `main:Eval.justReturn{v r4P}'),
(r7Z, Class `main:Eval.Evaluator{tc r7Z}'),
(r80, Identifier `main:Eval.eval{v r80}'),
(r81, Class `main:Eval.ContextProceed{tc r81}'),
(r82, Identifier `main:Eval.proceed{v r82}'),
(ra8, Data constructor `main:Eval.:DEvaluator{d ra8}'),
(ra9, Type constructor `main:Eval.:TEvaluator{tc ra9}'),
(raf, Data constructor `main:Eval.:DContextProceed{d raf}'),
(rag, Type constructor `main:Eval.:TContextProceed{tc rag}'),
(raj, Type constructor `main:Eval.:Co:TEvaluator{tc raj}'),
(rak, Identifier `main:Eval.:DEvaluator{v rak}'),
(rao, Type constructor `main:Eval.:Co:TContextProceed{tc rao}'),
(rap, Identifier `main:Eval.:DContextProceed{v rap}')]