let {

  input1 = derivation {
    name = "dependencies-input-1";
    system = "@system@";
    builder = "@shell@";
    args = ["-e" "-x" ./dependencies.builder1.sh];
    PATH = "@testPath@";
  };

  input2 = derivation {
    name = "dependencies-input-2";
    system = "@system@";
    builder = "@shell@";
    args = ["-e" "-x" ./dependencies.builder2.sh];
    PATH = "@testPath@";
  };

  body = derivation {
    name = "gc-concurrent2";
    system = "@system@";
    builder = "@shell@";
    args = ["-e" "-x" ./gc-concurrent2.builder.sh];
    PATH = "@testPath@";
    inherit input1 input2;
  };

}