@Override
	public void grammarError(ErrorType etype, org.antlr.runtime.Token token, Object... args) {
		tool.errMgr.grammarError(etype, getSourceName(), token, args);
	}
Override error handling for use with ANTLR tool itself; leaves
 nothing in grammar associated with Tool so others can use in IDEs, ...
tool/src/org/antlr/v4/parse/ToolANTLRParser.java