code: public void enterLambdaScope(Map<String,Object> args) {
          if (lambdaArgs == null) {
              lambdaArgs = new Stack<Map<String,Object>>();
          }
          lambdaArgs.push(args);
      }
docs: Installs a Lambda argument map, in preparation for the evaluation
  of a Lambda expression.  The arguments in the map will be in scope
  during the evaluation of the Lambda expression.
  @param args The Lambda arguments map
  @since EL 3.0