mkSpecOcc = mk_simple_deriv varName "$s"
mkForeignExportOcc = mk_simple_deriv varName "$f"
mkNewTyCoOcc = mk_simple_deriv tcName ":Co"
mkSpecOcc = mk_simple_deriv varName "$s"
mkForeignExportOcc = mk_simple_deriv varName "$f"
mkNewTyCoOcc = mk_simple_deriv tcName ":Co"