anchor.diff:      };
       swift = fetch {
         repo = "swift";
  -      sha256 = "1flvr12bg8m4k44yq0xy9qrllv5rpxgxisjgbpakk5p3myfsx7ky";
  +      sha256 = "1ydx11pkvaasgjbr29lnha0lpnak758gd5l0aqzmp3q6mcyvfm7a";
       };
     };
   
  
positive.code:     };
      lldb = fetch {
        repo = "swift-lldb";
        sha256 = "09x3d3bc6rn9g6jpi3fb120c4r2carsmqla4bq4scjrs0867jz9m";
      };
      llbuild = fetch {
        repo = "swift-llbuild";
  
negative.code:     };
      foundation = fetch {
        repo = "swift-corelibs-foundation";
        sha256 = "1bhrag63rmz41bg2g6ap01qrdpq37hislgf5hg6myy2v69q7mahx";
      };
      libdispatch = fetch {
        repo = "swift-corelibs-libdispatch";
  