anchor.diff:    }
   
     /**
  -   * Execute [callback], gathering any local closures in
  -   * [_localClosureIndexMap], and return the resulting map.
  -   *
  -   * Properly handles cases where one closure is nested within another.
  -   */
  -  Map<int, int> _withLocalClosureIndexMap(void callback()) {
  -    Map<int, int> prevLocalClosureIndexMap = _localClosureIndexMap;
  -    _localClosureIndexMap = <int, int>{};
  -    callback();
  -    Map<int, int> localClosureIndexMap = _localClosureIndexMap;
  -    _localClosureIndexMap = prevLocalClosureIndexMap;
  -    return localClosureIndexMap;
  -  }
  -
  -  /**
      * Helper method to determine if a given [typeName] refers to `dynamic`.
      */
     static bool isDynamic(TypeName typeName) {
  
positive.code:     b.documentationComment = serializeDocumentation(node.documentationComment);
      b.annotations = serializeAnnotations(node.metadata);
      b.codeRange = serializeCodeRange(node);
      Map<int, int> localClosureIndexMap = _withLocalClosureIndexMap(() {
        serializeFunctionBody(b, node.initializers, node.body);
      });
      if (node.constKeyword != null) {
        Set<String> constructorParameterNames =
            node.parameters.parameters.map((p) => p.identifier.name).toSet();
  
negative.code:       b.documentationComment = serializeDocumentation(documentationComment);
        b.annotations = serializeAnnotations(annotations);
        b.codeRange = serializeCodeRange(variables.parent);
        bool serializeBodyExpr = variable.isConst ||
            variable.isFinal && isField && !isDeclaredStatic ||
            variables.type == null;
        b.initializer =
            serializeInitializerFunction(variable.initializer, serializeBodyExpr);
        if (variable.initializer != null &&
            (variables.isFinal || variables.isConst)) {
          b.propagatedTypeSlot = assignSlot();
  