Remove visitLabelElement() and visitLocalVariableElement().

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 5543 matching lines @@
     int offset = super.nameOffset;
     if (offset == 0 &&
         _unlinkedLabel != null &&
         _unlinkedLabel.nameOffset != 0) {
       return _unlinkedLabel.nameOffset;
     }
     return offset;
   }
 
   @override
-  T accept<T>(ElementVisitor<T> visitor) => visitor.visitLabelElement(this);
+  T accept<T>(ElementVisitor<T> visitor) => null;

[Brian Wilkerson, 2017/07/06 22:42:52]

It would be better to throw a not-implemented exception, just to make it
explicit that the visitor won't be called.

[scheglov, 2017/07/07 15:05:33]

Done.

 
   /**
    * Create and return [LabelElement]s for the given [unlinkedLabels].
    */
   static List<LabelElement> resynthesizeList(
       ExecutableElementImpl enclosingExecutable,
       List<UnlinkedLabel> unlinkedLabels) {
     int length = unlinkedLabels.length;
     if (length != 0) {
       List<LabelElement> elements = new List<LabelElement>(length);
@@ skipping 800 matching lines @@
       return new SourceRange(
           _unlinkedVariable.visibleOffset, _unlinkedVariable.visibleLength);
     }
     if (_visibleRangeLength < 0) {
       return null;
     }
     return new SourceRange(_visibleRangeOffset, _visibleRangeLength);
   }
 
   @override
-  T accept<T>(ElementVisitor<T> visitor) =>
-      visitor.visitLocalVariableElement(this);
+  T accept<T>(ElementVisitor<T> visitor) => null;
 
   @override
   void appendTo(StringBuffer buffer) {
     buffer.write(type);
     buffer.write(" ");
     buffer.write(displayName);
   }
 
   @override
   Declaration computeNode() => getNodeMatching(
@@ skipping 2537 matching lines @@
 
   @override
   DartObject computeConstantValue() => null;
 
   @override
   void visitChildren(ElementVisitor visitor) {
     super.visitChildren(visitor);
     _initializer?.accept(visitor);
   }
 }