SKIP: FAILED Validation Failure: #include using namespace metal; void fwidthFine_ff6aa0() { float2 res = fwidth(float2()); } vertex void vertex_main() { fwidthFine_ff6aa0(); return; } fragment void fragment_main() { fwidthFine_ff6aa0(); return; } kernel void compute_main() { fwidthFine_ff6aa0(); return; } tint_YbLbM2.metal:5:10: warning: unused variable 'res' [-Wunused-variable] float2 res = fwidth(float2()); ^ tint_YbLbM2.metal:8:13: error: vertex function 'vertex_main' uses unsupported builtin functions vertex void vertex_main() { ^ note: function air.fwidth.v2f32 is not allowed within a vertex function tint_YbLbM2.metal:18:13: error: kernel function 'compute_main' uses unsupported builtin functions kernel void compute_main() { ^ note: function air.fwidth.v2f32 is not allowed within a kernel function 1 warning and 2 errors generated.