id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
2449,panic with GeneralizedNewtypeDeriving and a .hs-boot file,igloo,igloo,"With `A.hs-boot`:
{{{
module A where

data A
    deriving Show
}}}
We can get a panic:
{{{
$ ghc -c -XGeneralizedNewtypeDeriving A.hs-boot

A.hs-boot:5:13:ghc: panic! (the 'impossible' happened)
  (GHC version 6.9.20080716 for x86_64-unknown-linux):
        newTyConEtadRhs main:A.A{tc r6K}

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
}}}
",bug,closed,normal,6.10.1,Compiler,6.9,fixed,,,Unknown/Multiple,Unknown/Multiple,,Unknown,drvfail016,,,