Method requireElement

src/core/kernel.js:242–246

(type, parser, message, root)

    }

    requireElement(type, parser, message, root) {
        var result = this.parseElement(type, parser, root);
        if (!result) parser.raiseError(message || "Expected " + type);
        return result;
    }

    parseAnyOf(types, parser) {
        for (var i = 0; i < types.length; i++) {