Try to resolve incrementally whole functions, constructors or methods.

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 4930 matching lines @@
  *   | [ExportDirective]
  *
  * declarations ::=
  *     [CompilationUnitMember]*
  * </pre>
  */
 class CompilationUnit extends AstNode {
   /**
    * The first token in the token stream that was parsed to form this compilation unit.
    */
-  final Token beginToken;
+  Token beginToken;
 
   /**
    * The script tag at the beginning of the compilation unit, or `null` if there is no script
    * tag in this compilation unit.
    */
   ScriptTag _scriptTag;
 
   /**
    * The directives contained in this compilation unit.
    */
@@ skipping 15741 matching lines @@
   }
 
   @override
   accept(AstVisitor visitor) => visitor.visitYieldStatement(this);
 
   @override
   void visitChildren(AstVisitor visitor) {
     safelyVisitChild(_expression, visitor);
   }
 }