(function (tree) {

tree.Paren = function (node) {

this.value = node;

}; tree.Paren.prototype = {

toCSS: function (env) {
    return '(' + this.value.toCSS(env) + ')';
},
eval: function (env) {
    return new(tree.Paren)(this.value.eval(env));
}

};

})(require('../tree'));