anchor.diff:  
   buildPythonPackage rec {
     pname = "enaml";
  -  version = "0.14.1";
  +  version = "0.15.0";
   
     src = fetchFromGitHub {
       owner = "nucleic";
       repo = pname;
  -    rev = version;
  -    sha256 = "sha256-QfI7cwl2c5HOlFNNdG+oOv48X9jJZnZNU/kWgutWe6k=";
  +    rev = "refs/tags/${version}";
  +    sha256 = "sha256-xSMgT8VooDS5kvf4BCcVbv/MNfRDTVnPKU3Ou+/Gq7I=";
     };
   
     # qt bindings cannot be found during tests
  
positive.code:     "enaml.workbench"
    ];
  
    propagatedBuildInputs = [
      atom
      ply
  
negative.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , setuptools-scm
  , atom
  , ply
  , kiwisolver
  