Issue 26874. Don't report CAN_BE_NULL_AFTER_NULL_AWARE for members of the Null class.

pkg/analyzer/test/generated/hint_code_test.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 analyzer.test.generated.hint_code_test;
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source_io.dart';
@@ skipping 101 matching lines @@
     Source source = addSource(r'''
 m(x) {
   x?.a?.b;
 }
 ''');
     computeLibrarySourceErrors(source);
     assertNoErrors(source);
     verify([source]);
   }
 
+  void test_canBeNullAfterNullAware_false_null() {
+    Source source = addSource(r'''
+m(x) {
+  x?.a.hashCode;
+  x?.a.runtimeType;
+  x?.a.toString();
+  x?.b().hashCode;
+  x?.b().runtimeType;
+  x?.b().toString();
+}
+''');
+    computeLibrarySourceErrors(source);
+    assertNoErrors(source);
+    verify([source]);
+  }
+
   void test_canBeNullAfterNullAware_methodInvocation() {
     Source source = addSource(r'''
 m(x) {
   x?.a.b();
 }
 ''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.CAN_BE_NULL_AFTER_NULL_AWARE]);
     verify([source]);
   }
@@ skipping 3781 matching lines @@
   n() {
     var a = m(), b = m();
   }
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(
         source, [HintCode.USE_OF_VOID_RESULT, HintCode.USE_OF_VOID_RESULT]);
     verify([source]);
   }
 }