SKIP: FAILED

cbuffer cbuffer_u : register(b0, space0) {
  uint4 u[1];
};

[numthreads(1, 1, 1)]
void main() {
  uint2 ubo_load = u[0].xy;
  vector<float16_t, 2> ubo_load_xz = vector<float16_t, 2>(f16tof32(ubo_load & 0xFFFF));
  float16_t ubo_load_y = f16tof32(ubo_load[0] >> 16);
  const vector<float16_t, 3> x = vector<float16_t, 3>(ubo_load_xz[0], ubo_load_y, ubo_load_xz[1]);
  return;
}
FXC validation failure:
D:\Projects\RampUp\dawn\test\tint\buffer\Shader@0x000001734B456BC0(8,10-18): error X3000: syntax error: unexpected token 'float16_t'
D:\Projects\RampUp\dawn\test\tint\buffer\Shader@0x000001734B456BC0(9,3-11): error X3000: unrecognized identifier 'float16_t'
D:\Projects\RampUp\dawn\test\tint\buffer\Shader@0x000001734B456BC0(9,13-22): error X3000: unrecognized identifier 'ubo_load_y'