@Override
	public Handle wildcard(GrammarAST node) {
		ATNState left = newState(node);
		ATNState right = newState(node);
		left.addTransition(new WildcardTransition(right));
		node.atnState = left;
		return new Handle(left, right);
	}
Build an atom with all possible values in its label.
tool/src/org/antlr/v4/automata/ParserATNFactory.java