docs: @Nullable
    public static com.google.rpc.Status fromThrowable(Throwable t) {
      Throwable cause = checkNotNull(t, "t");
      while (cause != null) {
        if (cause instanceof StatusException) {
          StatusException e = (StatusException) cause;
          return fromStatusAndTrailers(e.getStatus(), e.getTrailers());
        } else if (cause instanceof StatusRuntimeException) {
          StatusRuntimeException e = (StatusRuntimeException) cause;
          return fromStatusAndTrailers(e.getStatus(), e.getTrailers());
        }
        cause = cause.getCause();
      }
      return null;
    }