test/expressions/index/var/let/param/matrix.wgsl

fn f(x : i32) -> vec3<f32> {
  var m = mat3x3<f32>(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0);
  let i = x;
  return m[i];
}