Fixed bug causing invocation error when accessing undefined static members on a non-class base

lib/ClassBuilder.js

@@ -927,7 +927,12 @@ function attachStatic( ctor, members, base, inheriting )
             // if we don't own the property, let the parent(s) handle it
             if ( found === false )
             {
-                return base.$.apply( context, arguments );
+                // TODO: This check is simple, but quick. It may be worth
+                // setting a flag on the class during definition to specify if
+                // it's extending from a non-class base.
+                return ( base.__cid && base.$ || exports.ClassBase.$ ).apply(
+                    context, arguments
+                );
             }
 
             var prop_item = props[ found ][ prop ];

test/test-class_builder-static.js

@@ -483,6 +483,49 @@ require( 'common' ).testCase(
     },
 
 
+    /**
+     * Same as above test. In this case, we have to keep in mind that non-class
+     * bases may not have the static accessor method defined. In that case,
+     * attempting to call it would cause an error.
+     *
+     * Of course, even if they did have a static accessor method defined, we
+     * wouldn't want to use it, as it isn't the one provided by us. Let's close
+     * up as many holes in the framework as we can. It's more to prevent
+     * unintended side-effects than anything. There's not much one could do with
+     * a "fake" static accessor method that they couldn't with a base class. So,
+     * for good measure, we'll declare one on our test base.
+     */
+    'Accessing static accessor method on non-class base also works': function()
+    {
+        var _self = this,
+            base  = function() {},
+            Test  = _self.builder.build( base, {} )
+        ;
+
+        // we do not want to call this
+        base.$ = function()
+        {
+            _self.fail(
+                "Should not call static accessor method of non-class base"
+            );
+        };
+
+        // get
+        this.assertEqual( undefined, Test.$( 'foo' ) );
+
+        // set
+        this.assertThrows(
+            function()
+            {
+                Test.$( 'foo', 'val' );
+            },
+            ReferenceError,
+            "Attempting to set an undeclaraed static property results in an " +
+                "exception on non-class base"
+        );
+    },
+
+
     /**
      * Protected members should be available from within the class but shouldn't
      * be exposed to the world