{ mkDerivation, base, fetchurl, HUnit, stm, test-framework
, test-framework-hunit
}:
mkDerivation {
  pname = "async";
  version = "2.1.1.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base stm ];
  testHaskellDepends = [
    base HUnit test-framework test-framework-hunit
  ];
  homepage = "https://github.com/simonmar/async";
  description = "Run IO operations asynchronously and wait for their results";
  license = stdenv.lib.licenses.bsd3;
}