lib/less/js/lib/less/tree/quoted.js in less-2.3.0 vs lib/less/js/lib/less/tree/quoted.js in less-2.3.1

@@ -18,12 +18,26 @@
         var that = this;
         var value = this.value.replace(/`([^`]+)`/g, function (_, exp) {
             return new(tree.JavaScript)(exp, that.index, true).eval(env).value;
         }).replace(/@\{([\w-]+)\}/g, function (_, name) {
             var v = new(tree.Variable)('@' + name, that.index).eval(env);
-            return ('value' in v) ? v.value : v.toCSS();
+            return (v instanceof tree.Quoted) ? v.value : v.toCSS();
         });
         return new(tree.Quoted)(this.quote + value + this.quote, value, this.escaped, this.index);
+    },
+    compare: function (x) {
+        if (!x.toCSS) {
+            return -1;
+        }
+        
+        var left = this.toCSS(),
+            right = x.toCSS();
+        
+        if (left === right) {
+            return 0;
+        }
+        
+        return left < right ? -1 : 1;
     }
 };
 
 })(require('../tree'));