SKIP: FAILED

[numthreads(1, 1, 1)]
void unused_entry_point() {
  return;
}

static float16_t t = float16_t(0.0h);

matrix<float16_t, 4, 4> m() {
  t = (t + float16_t(1.0h));
  return matrix<float16_t, 4, 4>(vector<float16_t, 4>(float16_t(1.0h), float16_t(2.0h), float16_t(3.0h), float16_t(4.0h)), vector<float16_t, 4>(float16_t(5.0h), float16_t(6.0h), float16_t(7.0h), float16_t(8.0h)), vector<float16_t, 4>(float16_t(9.0h), float16_t(10.0h), float16_t(11.0h), float16_t(12.0h)), vector<float16_t, 4>(float16_t(13.0h), float16_t(14.0h), float16_t(15.0h), float16_t(16.0h)));
}

void f() {
  const matrix<float16_t, 4, 4> tint_symbol = m();
  float4x4 v = float4x4(tint_symbol);
}
FXC validation failure:
D:\Projects\RampUp\dawn\test\tint\expressions\type_conv\Shader@0x000001A405986C50(6,8-16): error X3000: unrecognized identifier 'float16_t'