code: void markAllParametersEscaped() {
      Node paramList = NodeUtil.getFunctionParameters(jsScope.getRootNode());
      for (Node arg = paramList.getFirstChild(); arg != null; arg = arg.getNext()) {
        if (arg.isRest() || arg.isDefaultValue()) {
          escaped.add(jsScope.getVar(arg.getFirstChild().getString()));
        } else {
          escaped.add(jsScope.getVar(arg.getString()));
        }
      }
    }
docs: Give up computing liveness of formal parameter by putting all the parameter names in the
  escaped set.