lib/less/js/lib/less/tree/keyword.js in less-2.5.1 vs lib/less/js/lib/less/tree/keyword.js in less-2.6.0

@@ -3,9 +3,10 @@
 tree.Keyword = function (value) { this.value = value; };
 tree.Keyword.prototype = {
     type: "Keyword",
     eval: function () { return this; },
     genCSS: function (env, output) {
+        if (this.value === '%') { throw { type: "Syntax", message: "Invalid % without number" }; }
         output.add(this.value);
     },
     toCSS: tree.toCSS,
     compare: function (other) {
         if (other instanceof tree.Keyword) {