Ignore two unused element warnings in pkg/analysis_server.

pkg/analysis_server/test/src/computer/closingLabels_computer_test.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/computer/computer_closingLabels.dart';
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:test/test.dart';
@@ skipping 251 matching lines @@
               "c",
             ]),
           ),
         ),
       ],
     ),
   );
 }
 """;
 
+    // ignore: unused_local_variable
     var labels = await _computeElements(content);
-    // TODO(dantup) Results here are currently bad so this test is just checking that we
-    // dont crash. Need to confirm what to do here; the bad labels might not be fixed
-    // until the code is using the new shared parser.
+    // TODO(dantup): Results here are currently bad so this test is just
+    // checking that we don't crash. Need to confirm what to do here; the bad
+    // labels might not be fixed until the code is using the new shared parser.
     // https://github.com/dart-lang/sdk/issues/30370
   }
 
   Future<List<ClosingLabel>> _computeElements(String sourceContent) async {
     provider.newFile(sourcePath, sourceContent);
     ResolveResult result = await driver.getResult(sourcePath);
     DartUnitClosingLabelsComputer computer =
         new DartUnitClosingLabelsComputer(result.lineInfo, result.unit);
     return computer.compute();
   }
@@ skipping 26 matching lines @@
       var expectedLength = endMatch.start - expectedStart;
       var expectedLabel = endMatch.group(1);
 
       expect(
           labels,
           contains(
               new ClosingLabel(expectedStart, expectedLength, expectedLabel)));
     });
   }
 }