private void walkParseTree(List<SwiftBaseListener> listeners,TopLevelContext tree){
  ParseTreeWalker walker=new ParseTreeWalker();
  listeners.forEach(null);
}

private void walkParseTree ( List < SwiftBaseListener > listeners , TopLevelContext tree ) { ParseTreeWalker walker = new ParseTreeWalker ( ) ; listeners . forEach ( null ) ; }
walks the provided parse tree using the list of listeners .
