Prepare CompilationUnitElementDelta in IncrementalCompilationUnitElementBuilder.

pkg/analyzer/lib/src/generated/ast.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.ast;
 
 import 'dart:collection';
@@ skipping 4658 matching lines @@
 
   /**
    * The declarations contained in this compilation unit.
    */
   NodeList<CompilationUnitMember> _declarations;
 
   /**
    * The last token in the token stream that was parsed to form this compilation
    * unit. This token should always have a type of [TokenType.EOF].
    */
-  final Token endToken;
+  Token endToken;
 
   /**
    * The element associated with this compilation unit, or `null` if the AST
    * structure has not been resolved.
    */
   CompilationUnitElement element;
 
   /**
    * The line information for this compilation unit.
    */
@@ skipping 15366 matching lines @@
   }
 
   @override
   accept(AstVisitor visitor) => visitor.visitYieldStatement(this);
 
   @override
   void visitChildren(AstVisitor visitor) {
     _safelyVisitChild(_expression, visitor);
   }
 }