Migrate UnlinkedVariable.constExpr to UnlinkedExecutable.bodyExpr.

pkg/analyzer/lib/src/summary/summarize_ast.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 serialization.summarize_ast;
 
 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/type.dart' show DartType;
@@ skipping 883 matching lines @@
       b.annotations = serializeAnnotations(annotations);
       b.codeRange = serializeCodeRange(variables.parent);
       Map<int, int> localClosureIndexMap = _withLocalClosureIndexMap(() {
         b.initializer = serializeInitializerFunction(variable.initializer);
       });
       if (variable.isConst ||
           variable.isFinal && isField && !isDeclaredStatic ||
           variables.type == null) {
         Expression initializer = variable.initializer;
         if (initializer != null) {
-          b.constExpr = serializeConstExpr(localClosureIndexMap, initializer);
+          b.initializer.bodyExpr =
+              serializeConstExpr(localClosureIndexMap, initializer);
         }
       }
       if (variable.initializer != null &&
           (variables.isFinal || variables.isConst)) {
         b.propagatedTypeSlot = assignSlot();
       }
       bool isSemanticallyStatic = !isField || isDeclaredStatic;
       if (variables.type == null &&
           (variable.initializer != null || !isSemanticallyStatic)) {
         b.inferredTypeSlot = assignSlot();
@@ skipping 427 matching lines @@
 /**
  * A [_TypeParameterScope] is a [_Scope] which defines [_ScopedTypeParameter]s.
  */
 class _TypeParameterScope extends _Scope {
   /**
    * Get the number of [_ScopedTypeParameter]s defined in this
    * [_TypeParameterScope].
    */
   int get length => _definedNames.length;
 }