SKIP: FAILED

struct VertexOutput {
  float4 pos;
  vector<float16_t, 4> prevent_dce;
};

struct vertex_main_outputs {
  nointerpolation vector<float16_t, 4> VertexOutput_prevent_dce : TEXCOORD0;
  float4 VertexOutput_pos : SV_Position;
};


RWByteAddressBuffer prevent_dce : register(u0);
vector<float16_t, 4> trunc_ce7c17() {
  vector<float16_t, 4> arg_0 = (float16_t(1.5h)).xxxx;
  vector<float16_t, 4> v = arg_0;
  vector<float16_t, 4> v_1 = floor(v);
  vector<float16_t, 4> res = (((v < (float16_t(0.0h)).xxxx)) ? (ceil(v)) : (v_1));
  return res;
}

void fragment_main() {
  prevent_dce.Store<vector<float16_t, 4> >(0u, trunc_ce7c17());
}

[numthreads(1, 1, 1)]
void compute_main() {
  prevent_dce.Store<vector<float16_t, 4> >(0u, trunc_ce7c17());
}

VertexOutput vertex_main_inner() {
  VertexOutput tint_symbol = (VertexOutput)0;
  tint_symbol.pos = (0.0f).xxxx;
  tint_symbol.prevent_dce = trunc_ce7c17();
  VertexOutput v_2 = tint_symbol;
  return v_2;
}

vertex_main_outputs vertex_main() {
  VertexOutput v_3 = vertex_main_inner();
  VertexOutput v_4 = v_3;
  VertexOutput v_5 = v_3;
  vertex_main_outputs v_6 = {v_5.prevent_dce, v_4.pos};
  return v_6;
}

FXC validation failure:
c:\src\dawn\Shader@0x00000262490AF460(3,10-18): error X3000: syntax error: unexpected token 'float16_t'