Needs new Amber, because instVarNamed:.

package.json

@@ -28,7 +28,7 @@
   },
   "dependencies": {
     "@ambers/contrib-web": ">=0.7.3",
-    "@ambers/lang": ">0.23.0",
+    "@ambers/lang": ">0.24.0",
     "codemirror": ">=5.44.0",
     "jquery-ui-dist": ">=1.9.2",
     "require-css": "^0.1.10"