fix completion after dot-keyword - fixes #23882

pkg/analysis_server/test/services/completion/prefixed_element_contributor_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 test.services.completion.invocation;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
@@ skipping 199 matching lines @@
 ''');
     return computeFull((bool result) {
       // TODO(paulberry): modify assertSuggestSetter so that we can pass 'int'
       // as a parmeter to it, and it will check the appropriate field in
       // the suggestion object.
       CompletionSuggestion suggestion = assertSuggestSetter('t');
       expect(suggestion.element.parameters, '(int value)');
     });
   }
 
+  test_keyword() {
+    addTestSource('class C { static C get instance => null; } main() {C.in^}');
+    return computeFull((bool result) {
+      assertSuggestGetter('instance', 'C');
+    });
+  }
+
   test_libraryPrefix() {
     // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
     addTestSource('import "dart:async" as bar; foo() {bar.^}');
     return computeFull((bool result) {
       assertSuggestClass('Future');
       assertNotSuggested('loadLibrary');
     });
   }
 
   test_libraryPrefix2() {
@@ skipping 420 matching lines @@
       assertNotSuggested('ms2');
       assertSuggestInvocationMethod('m', 'C2', null,
           relevance: DART_RELEVANCE_HIGH);
       assertNotSuggested('fi3');
       assertNotSuggested('fs3');
       assertNotSuggested('mi3');
       assertNotSuggested('ms3');
     });
   }
 }