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

pkg/analyzer/test/generated/incremental_resolver_test.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.test.generated.incremental_resolver_test;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 3972 matching lines @@
 ''');
     _updateAndValidate(r'''
 class A {
   m() {
     print(2 + 3);
   }
 }
 ''');
   }
 
+  void test_inBody_functionExpression() {
+    _resolveUnit(r'''
+class C extends D {
+  static final f = () {
+    var x = 0;
+  }();
+}
+
+class D {}
+''');
+    _updateAndValidate(r'''
+class C extends D {
+  static final f = () {
+    var x = 01;
+  }();
+}
+
+class D {}
+''');
+  }
+
   void test_inBody_insertStatement() {
     _resolveUnit(r'''
 main() {
   print(1);
 }
 ''');
     _updateAndValidate(r'''
 main() {
   print(0);
   print(1);
@@ skipping 936 matching lines @@
     return ResolutionContextBuilder.contextFor(node, listener).scope;
   }
 }
 
 class _Edit {
   final int offset;
   final int length;
   final String replacement;
   _Edit(this.offset, this.length, this.replacement);
 }