anchor.diff:        ${args.lcov}/bin/lcov --remove app.info $lcovFilter > app2.info
         set +o noglob
         mv app2.info app.info
  +
         mkdir $out/coverage
  -      ${args.lcov}/bin/genhtml app.info -o $out/coverage > log
  +      ${args.lcov}/bin/genhtml app.info $lcovExtraTraceFiles -o $out/coverage > log
   
         # Grab the overall coverage percentage for use in release overviews.
         grep "Overall coverage rate" log | sed 's/^.*(\(.*\)%).*$/\1/' > $out/nix-support/coverage-rate
  
positive.code: 
      lcovFilter = ["/nix/store/*"] ++ lcovFilter;
  
  
      meta = (if args ? meta then args.meta else {}) // {
        description = if doCoverageAnalysis then "Coverage analysis" else "Native Nix build on ${stdenv.system}";
  
negative.code: 
  { doCoverageAnalysis ? false
  , lcovFilter ? []
  , lcovExtraTraceFiles ? []
  , src, stdenv
  , name ? if doCoverageAnalysis then "nix-coverage" else "nix-build"
  , ... } @ args:
  