@fragment fn main( @builtin(position) position : vec4<f32>, @builtin(front_facing) front_facing : bool, @builtin(sample_index) sample_index : u32, @builtin(sample_mask) sample_mask : u32, ) { if (front_facing) { let foo : vec4<f32> = position; let bar : u32 = sample_index + sample_mask; } }