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 '{'?


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