anchor.diff:    src = fetchPyPi {
       package = "m2r";
       inherit version;
  -    sha256 = "3448f770aed05ca10390d0917cd51836cbf82a2f095bc91507e6291cfab03223";
  +    sha256 = "a26bc2e25e0ad3f8650385aea25cf734ac4fcd30e54faec92fd39675da75e527";
     };
   
     buildInputs = [
  
positive.code:     mistune
    ];
  
    meta = with stdenv.lib; {
      maintainers = with maintainers; [
        wkennington
      ];
  
negative.code: { stdenv
  , buildPythonPackage
  , fetchPyPi
  , lib
  
  , docutils
  , mistune
  }:
  
  let
    version = "0.1.6";
  in
  buildPythonPackage {
    name = "m2r-${version}";
  