Fix FunctionTypeAliasElementImpl.visitChildren() for type parameters.

pkg/analyzer/lib/src/dart/element/element.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1746 matching lines @@
    */
   void setAnnotations(int offset, List<ElementAnnotation> annotations) {
     annotationMap ??= new HashMap<int, List<ElementAnnotation>>();
     annotationMap[offset] = annotations;
   }
 
   @override
   void visitChildren(ElementVisitor visitor) {
     super.visitChildren(visitor);
     safelyVisitChildren(accessors, visitor);
-    safelyVisitChildren(_enums, visitor);
+    safelyVisitChildren(enums, visitor);
     safelyVisitChildren(functions, visitor);
     safelyVisitChildren(functionTypeAliases, visitor);
     safelyVisitChildren(types, visitor);
     safelyVisitChildren(topLevelVariables, visitor);
   }
 }
 
 /**
  * A [FieldElement] for a 'const' or 'final' field that has an initializer.
  *
@@ skipping 3076 matching lines @@
         return typeParameterImpl;
       }
     }
     return null;
   }
 
   @override
   void visitChildren(ElementVisitor visitor) {
     super.visitChildren(visitor);
     safelyVisitChildren(parameters, visitor);
-    safelyVisitChildren(_typeParameters, visitor);
+    safelyVisitChildren(typeParameters, visitor);
   }
 }
 
 /**
  * A concrete implementation of a [HideElementCombinator].
  */
 class HideElementCombinatorImpl implements HideElementCombinator {
   /**
    * The unlinked representation of the combinator in the summary.
    */
@@ skipping 3730 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }