code: public static List<AbstractElement> getFirstSet(AbstractElement element) {
  		return org.eclipse.xtext.xtext.generator.parser.antlr.AntlrGrammarGenUtil.getFirstSet(element);
  	}
docs: Returns the first-set of the given abstractElement. That is, all keywords
  with distinct values and all rule calls to distinct terminals.
  @since 2.6