anchor.diff:  }:
   
   let
  -  v_major = "3.1";
  +  v_major = "3.1.1";
     version = "${v_major}-RELEASE";
     version_friendly = "${v_major}";
   
  
positive.code:     # For more inforation, see: https://github.com/apple/swift/pull/3594#issuecomment-234169759
      clang = fetch {
        repo = "swift-clang";
        sha256 = "0820mx1ghfnk4p5595r1f313y1699jwi61zghfbwak5wgwgy7n4x";
      };
      llvm = fetch {
        repo = "swift-llvm";
        sha256 = "0zb1zi77b2xdz5szlz2m3j3d92dc0q00dv8py2s6iaq3k435i3sq";
      };
      compilerrt = fetch {
        repo = "swift-compiler-rt";
  
negative.code:     };
      pm = fetch {
        repo = "swift-package-manager";
        sha256 = "1ayy5vk3mjk354pg9bf68wvnaj3jymx23w0qnlw1jxz256ff8fwi";
      };
      xctest = fetch {
        repo = "swift-corelibs-xctest";
  