id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
450,"""class A where a :: A -> Int"" panics GHC 6.4",carlossch,nobody,"{{{
Coming back to Haskell after a year off, I accidentally typed a very 
simple class definition wrong, and turns out that GHC 6.4 dies with 

ghc-6.4: panic! (the `impossible' happened, GHC version 6.4):
	ds_app_type Main.A{tc r1zQ} []

if you run

$ ghc crasher.hs
ghc-6.4: panic! (the `impossible' happened, GHC version 6.4):
	ds_app_type Main.A{tc r151} []

where crasher.hs is a file with a single line

class A where a :: A -> Int

I'm using the OSX version of GHC, by the way.

-carlos
}}}",bug,closed,normal,,None,None,Duplicate,,,,,,,,,,