anchor.diff:      _sourceUri = 'resources/templates/$_id';
       for (var vars in [globalVars, localVars]) {
         if (vars != null) {
  -        vars.forEach((name, value) => _vars.add(new TemplateVar(name, value)));
  +        vars.forEach((name, value) => _vars.add(new _TemplateVar(name, value)));
         }
       }
     }
  
positive.code: /**
   * Specifies a variable-to-value substitution in a template file text.
   */
  class TemplateVar {
    final String name;
    final String value;
  
    TemplateVar(this.name, this.value);
  
    String interpolate(String text) => text.replaceAll('``$name``', value);
  }
  
negative.code: class ProjectTemplate {
    String _id;
    String _sourceUri;
    List<_TemplateVar> _vars = [];
  
    ProjectTemplate(this._id,
                    [Map<String, String> globalVars,
  