anchor.diff:    haskellPlatformDefaults_2010_2_0_0 =
       self : self.haskellPlatformArgs_2010_2_0_0 self // {
         haskellPlatform = self.haskellPlatform_2010_2_0_0;
  +      repaExamples = null;	# don't pick this version of 'repa-examples' during nix-env -u
       };
   
     haskellPlatform_2010_2_0_0 =
  
positive.code:       haskellPlatform = self.haskellPlatform_2011_2_0_1;
        mtl1 = self.mtl_1_1_1_1;
        text = self.text_0_11_1_5;
      };
  
    haskellPlatform_2011_2_0_1 =
  
negative.code:     self : self.haskellPlatformArgs_2011_2_0_0 self // {
        haskellPlatform = self.haskellPlatform_2011_2_0_0;
        mtl1 = self.mtl_1_1_1_1;
        repaExamples = null;	# don't pick this version of 'repa-examples' during nix-env -u
      };
  
    haskellPlatform_2011_2_0_0 =
  