SKIP: FAILED


RWByteAddressBuffer prevent_dce : register(u0);
int subgroupBroadcast_1d79c7() {
  int res = WaveReadLaneAt(1, 1u);
  return res;
}

[numthreads(1, 1, 1)]
void compute_main() {
  prevent_dce.Store(0u, asuint(subgroupBroadcast_1d79c7()));
}

FXC validation failure:
c:\src\dawn\Shader@0x000002BDCDFFB900(4,13-33): error X3004: undeclared identifier 'WaveReadLaneAt'