anchor.diff:    final CodeChecker _codeChecker;
     final String _name;
   
  -  /// A flag indicating whether certain diagnostics related to top-level
  -  /// elements should be produced. The diagnostics are the ones introduced by
  -  /// the analyzer to signal to users when the version of type inference
  -  /// performed by the analyzer was unable to accurately infer type information.
  -  /// The implementation of type inference used by the task model still has
  -  /// these deficiencies, but the implementation used by the driver does not.
  -  // TODO(brianwilkerson) Remove this field when the task model has been
  -  // removed.
  -  final bool flagTopLevel;
  -
  -  _TopLevelInitializerValidator(this._codeChecker, this._name,
  -      {this.flagTopLevel = true});
  +  _TopLevelInitializerValidator(this._codeChecker, this._name);
   
     void validateHasType(AstNode n, PropertyAccessorElement e) {
       if (e.hasImplicitReturnType) {
  
positive.code:     if (method is ExecutableElement) {
        if (method.kind == ElementKind.METHOD &&
            !method.isStatic &&
            method.hasImplicitReturnType &&
            flagTopLevel) {
          _codeChecker._recordMessage(node,
              StrongModeCode.TOP_LEVEL_INSTANCE_METHOD, [_name, method.name]);
        }
        if (node.typeArguments == null && method.typeParameters.isNotEmpty) {
          if (method.kind == ElementKind.METHOD &&
              !method.isStatic &&
              _anyParameterHasImplicitType(method) &&
              flagTopLevel) {
            _codeChecker._recordMessage(node,
                StrongModeCode.TOP_LEVEL_INSTANCE_METHOD, [_name, method.name]);
          }
  
negative.code:           e is ExecutableElement &&
            e.kind == ElementKind.METHOD &&
            !e.isStatic) {
          if (_hasAnyImplicitType(e)) {
            _codeChecker._recordMessage(
                n, StrongModeCode.TOP_LEVEL_INSTANCE_METHOD, [_name, e.name]);
          }
  