test/tint/expressions/index/let/var/literal/matrix.wgsl

fn f() -> 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 = 1;
  return m[i];
}