Remove ExecutableElement.localVariables altogether.

pkg/analyzer/lib/src/generated/declaration_resolver.dart

 // Copyright (c) 2016, 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.generated.declaration_resolver;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 787 matching lines @@
     check(_enums, _enumIndex);
     check(_functions, _functionIndex);
     check(_parameters, _parameterIndex);
     check(_typedefs, _typedefIndex);
     check(_typeParameters, _typeParameterIndex);
     check(_variables, _variableIndex);
     Element element = this.element;
     if (element is ExecutableElementImpl) {
       element.functions = _elementHolder.functions;
       element.labels = _elementHolder.labels;
-      element.localVariables = _elementHolder.localVariables;
+      element.encloseElements(_elementHolder.localVariables);
     }
   }
 
   static bool _isNotSynthetic(Element e) => !e.isSynthetic;
 }
 
 class _ElementMismatchException extends AnalysisException {
   /**
    * Creates an exception to refer to the given [compilationUnit], [element],
    * and [cause].
    */
   _ElementMismatchException(
       CompilationUnitElement compilationUnit, Element element,
       [CaughtException cause = null])
       : super('Element mismatch in $compilationUnit at $element', cause);
 }