"pub cache repair" prints a more detailed summary.

test/cache/repair/handles_corrupted_global_lockfile_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 pub_tests;
 
+import 'package:pub/src/exit_codes.dart' as exit_codes;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('handles a corrupted global lockfile', () {
     d.dir(cachePath, [
       d.dir('global_packages/foo', [
         d.file('pubspec.lock', 'junk')
       ])
     ]).create();
 
     schedulePub(args: ["cache", "repair"],
         error: contains('Failed to reactivate foo:'),
-        output: contains('Failed to reactivate 1 package.'));
+        output: contains('Failed to reactivate 1 package:\n'
+                         '- foo'),
+        exitCode: exit_codes.UNAVAILABLE);
   });
 }