src/main/java/com/bazaarvoice/jless/parser/Parser.java
Rule Function() {
        return Sequence(
                Ident(), push(new FunctionNode(match())),
                Arguments(), peek(1).addChild(pop())
        );
    }
Rule Function() {
        return Sequence(
                Ident(), push(new FunctionNode(match())),
                Arguments(), peek(1).addChild(pop())
        );
    }
Ident Arguments