• simonpj@microsoft.com's avatar
    Fix nasty recompilation bug in MkIface.computeChangedOccs · c4ea1371
    simonpj@microsoft.com authored
    	MERGE to 6.8 branch
    In computeChangedOccs we look up the old version of a Name.
    But a WiredIn Name doesn't have an old version, because WiredIn things
    don't appear in interface files at all.
    Result: ghc-6.9: panic! (the 'impossible' happened)
      (GHC version 6.9 for x86_64-unknown-linux):
    	lookupVers1 base:GHC.Prim chr#{v}
    This fixes the problem.  The patch should merge easily onto the branch.
MkIface.lhs 59.2 KB