File template parsing bug?

I'm trying to use following file template

 * @fileoverview
 * @author ${USER}
 */

/**
 * @class \$ws.proto.${NAME}
 * @extends ${ParentClass}
 */
\$ws.proto.${NAME} = \$ws.core.extend(${ParentClass}, {
   constructor: function(config) {
      \$ws.proto.${NAME}.superclass.constructor.apply(this, arguments);
   }
});

When i try to create file from this template error occured (see attached screenshot)

Is it a bug in parser or my template is erroneous? Is some escaping is needed for '{'?