SKIP: FAILED

float3 subgroupBroadcast_912ff5() {
  float3 arg_0 = (1.0f).xxx;
  float3 res = WaveReadLaneAt(arg_0, 1u);
  return res;
}

[numthreads(1, 1, 1)]
void compute_main() {
  prevent_dce = subgroupBroadcast_912ff5();
}

DXC validation failure:
hlsl.hlsl:9:3: error: use of undeclared identifier 'prevent_dce'
  prevent_dce = subgroupBroadcast_912ff5();
  ^