private void println(int priority, String tag, String msg, Throwable tr) {
    Log.println(priority, prefixTag(tag), getMsg(msg, tr));
  }
Note: this gets forwarded to {@code android.util.Log.e} as {@code android.util.Log.wtf} might
crash the app.
fbcore/src/main/java/com/facebook/common/logging/FLogDefaultLoggingDelegate.java