SKIP: FAILED fn select_a2860e() { var res : vec4 = select(vec4(), vec4(), vec4()); } [[stage(vertex)]] fn vertex_main() { select_a2860e(); } [[stage(fragment)]] fn fragment_main() { select_a2860e(); } [[stage(compute)]] fn compute_main() { select_a2860e(); } Failed to generate: error: select not supported in HLSL backend yet