(new) variable variables

lib/less/parser.js

@@ -568,7 +568,7 @@ less.Parser = function Parser(env) {
                 variable: function () {
                     var name, index = i;
 
-                    if (input.charAt(i) === '@' && (name = $(/^@[\w-]+/))) {
+                    if (input.charAt(i) === '@' && (name = $(/^@@?[\w-]+/))) {
                         return new(tree.Variable)(name, index);
                     }
                 },

lib/less/tree/variable.js

@@ -5,13 +5,17 @@ tree.Variable.prototype = {
     eval: function (env) {
         var variable, v, name = this.name;
 
+        if (name.indexOf('@@') == 0) {
+            name = '@' + new(tree.Variable)(name.slice(1)).eval(env).value;
+        }
+
         if (variable = tree.find(env.frames, function (frame) {
             if (v = frame.variable(name)) {
                 return v.value.eval(env);
             }
         })) { return variable }
         else {
-            throw { message: "variable " + this.name + " is undefined",
+            throw { message: "variable " + name + " is undefined",
                     index: this.index };
         }
     }

test/css/variables.css

@@ -16,3 +16,6 @@
   url: url('Trebuchet');
   multi: something 'A', B, C, 'Trebuchet';
 }
+.variable-names {
+  name: 'hello';
+}

test/less/variables.less

@@ -38,3 +38,9 @@
     url: url(@a);
     multi: something @multi, @a;
 }
+
+.variable-names {
+    @var: 'hello';
+    @name: 'var';
+    name: @@name;
+}