anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  +, fetchpatch
   , pytest
   , pretend
   , freezegun
  
positive.code:     homepage = http://www.structlog.org/;
      license = lib.licenses.asl20;
    };
  }
negative.code:     sha256 = "6980001045abd235fa12582222627c19b89109e58b85eb77d5a5abc778df6e20";
    };
  
    patches = [
      # Fix tests for pytest 3.3
      (fetchpatch {
        url = "https://github.com/hynek/structlog/commit/22f0ae50607a0cb024361599f84610ce290deb99.patch";
        sha256 = "03622i13ammkpyrdk48kimbz94gbkpcmdpy0kj2z09m1kp6q2ljv";
      })
    ];
  
    checkInputs = [ pytest pretend freezegun ];
    propagatedBuildInputs = [ simplejson ];
  
  