anchor.diff:  in
   stdenv.mkDerivation rec {
     name    = "cquery-${version}";
  -  version = "2018-03-25";
  +  version = "2018-05-01";
   
     inherit src;
   
  
positive.code:   doInstallCheck = true;
    installCheckPhase = ''
      pushd ${src}
      $out/bin/cquery --ci --clang-sanity-check && \
      $out/bin/cquery --ci --test-unit
    '';
  
  
negative.code:   src = fetchFromGitHub {
      owner = "cquery-project";
      repo = "cquery";
      rev = "34b357bc5e873d52d2aa41287c6e138244cea109";
      sha256 = "0i34v30cl73485bzpbis539x0iq9whpv0403ca5a9h6vqwnvdn7c";
      fetchSubmodules = true;
    };
  
  