Issue 25314. Fix for incremental resolution of a function expression body in class declaration.

pkg/analyzer/lib/src/generated/incremental_resolver.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.generated.incremental_resolver;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 30 matching lines @@
 void set test_resolveApiChanges(bool value) {
   _resolveApiChanges = value;
 }
 
 /**
  * Instances of the class [DeclarationMatcher] determine whether the element
  * model defined by a given AST structure matches an existing element model.
  */
 class DeclarationMatcher extends RecursiveAstVisitor {
   /**
-   * The libary containing the AST nodes being visited.
+   * The library containing the AST nodes being visited.
    */
   LibraryElement _enclosingLibrary;
 
   /**
    * The compilation unit containing the AST nodes being visited.
    */
   CompilationUnitElement _enclosingUnit;
 
   /**
    * The function type alias containing the AST nodes being visited, or `null` if we are not
@@ skipping 96 matching lines @@
     _hasConstructor = false;
     super.visitClassDeclaration(node);
     // process default constructor
     if (!_hasConstructor) {
       ConstructorElement constructor = element.unnamedConstructor;
       _processElement(constructor);
       if (!constructor.isSynthetic) {
         _assertEquals(constructor.parameters.length, 0);
       }
     }
+    // matches, set the element
+    node.name.staticElement = element;
   }
 
   @override
   visitClassTypeAlias(ClassTypeAlias node) {
     String name = node.name.name;
     ClassElement element = _findElement(_enclosingUnit.types, name);
     _enclosingClass = element;
     _processElement(element);
     _assertSameTypeParameters(node.typeParameters, element.typeParameters);
     super.visitClassTypeAlias(node);
@@ skipping 1916 matching lines @@
   @override
   String toString() => name;
 }
 
 class _TokenPair {
   final _TokenDifferenceKind kind;
   final Token oldToken;
   final Token newToken;
   _TokenPair(this.kind, this.oldToken, this.newToken);
 }