id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
5961,GHC panic (nameModule) on malformed deriving clause,Philonous,,"Trying to derive a classname starting with a lower case letter and wrapped in parenthesis will lead to a ghc panic instead of generating an error

minimal testcase:

{{{
module Foo where
data Foo = Foo deriving (abc)
}}}

output: 

{{{
[1 of 1] Compiling Foo              ( scratch3.hs, scratch3.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 7.4.1 for x86_64-unknown-linux):
        nameModule abc{tv a9I}

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

}}}

",bug,closed,normal,7.6.1,Compiler,7.4.1,fixed,,,Linux,Unknown/Multiple,Compile-time crash,Unknown,,,,