SKIP: FAILED fn modf_c82e3f() { var arg_1 : vec4; var res : vec4 = modf(vec4(), &(arg_1)); } [[stage(vertex)]] fn vertex_main() { modf_c82e3f(); } [[stage(fragment)]] fn fragment_main() { modf_c82e3f(); } [[stage(compute)]] fn compute_main() { modf_c82e3f(); } Failed to generate: error: Unknown builtin method: modf