fix code completion in string literals

pkg/analysis_server/test/services/completion/completion_test_util.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.util;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol show Element,
     ElementKind;
@@ skipping 2310 matching lines @@
       assertSuggestImportedFunction('nowIsIt', null);
       assertNotSuggested('T1');
       // TODO (danrubel) this really should be TopLevelVar not getter/setter
       assertSuggestTopLevelVarGetterSetter('newT1', 'int');
       assertNotSuggested('z');
       assertSuggestLocalTopLevelVar('m', 'dynamic');
       assertSuggestLocalFunction('newer', 'String');
     });
   }
 
+  test_Literal_list() {
+    // ']'  ListLiteral  ArgumentList  MethodInvocation
+    addTestSource('main() {var Some; print([^]);}');
+    computeFast();
+    return computeFull((bool result) {
+      assertSuggestLocalVariable('Some', null);
+      assertSuggestImportedClass('String');
+    });
+  }
+
+  test_Literal_list2() {
+    // SimpleIdentifier ListLiteral  ArgumentList  MethodInvocation
+    addTestSource('main() {var Some; print([S^]);}');
+    computeFast();
+    return computeFull((bool result) {
+      assertSuggestLocalVariable('Some', null);
+      assertSuggestImportedClass('String');
+    });
+  }
+
   test_Literal_string() {
     // SimpleStringLiteral  ExpressionStatement  Block
     addTestSource('class A {a() {"hel^lo"}}');
     computeFast();
     return computeFull((bool result) {
       assertNoSuggestions();
     });
   }
 
   test_MethodDeclaration_body_getters() {
@@ skipping 606 matching lines @@
       assertNotSuggested('bar2');
       assertNotSuggested('_B');
       assertSuggestLocalClass('Y');
       assertSuggestLocalClass('C');
       assertSuggestLocalVariable('f', null);
       assertNotSuggested('x');
       assertNotSuggested('e');
     });
   }
 }