id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
1919,GHC 6.8.1 panics with lookupRecBndr,BjornBuckwalter,igloo,"When building the CGS module in the [http://dimensional.googlecode.com dimensional] library GHC 6.8.1 panics with the following message:
{{{
ghc-6.8.1: panic! (the 'impossible' happened)
  (GHC version 6.8.1 for powerpc-apple-darwin):
        lookupRecBndr $dSucc{v a202} [lid]
}}}
The library in general and CGS module in particular is full of type hackery. If it is of any help `Succ` is defined in Numeric.NumType.

The same error occurs when compiling on x86/Windows so it doesn't seem to be platform specific.

Steps to reproduce:

 * Download [http://dimensional.googlecode.com/files/dimensional-0.7.1.tar.gz dimensional 0.7.1].
 * Uncomment the Numeric.Units.Dimensional.CGS module in dimensional.cabal.
 * Use the cabal process to configure and build.

This doesn't happen in GHC 6.6.1.",merge,closed,normal,6.8.2,Compiler,6.8.1,fixed,,,Unknown/Multiple,Unknown/Multiple,,Unknown,,,,