"pub global run" errors out for a mismatched SDK.

test/global/run/recompiles_if_snapshot_is_out_of_date_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.
 
 import 'package:scheduled_test/scheduled_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
-  integration('recompiles a script if the SDK version is out-of-date', () {
+  integration('recompiles a script if the snapshot is out-of-date', () {
     servePackages((builder) {
       builder.serve("foo", "1.0.0", contents: [
         d.dir("bin", [
           d.file("script.dart", "main(args) => print('ok');")
         ])
       ]);
     });
 
     schedulePub(args: ["global", "activate", "foo"]);
 
@@ skipping 16 matching lines @@
       d.dir('global_packages', [
         d.dir('foo', [
           d.dir('bin', [
             d.matcherFile('script.dart.snapshot', contains('ok'))
           ])
         ])
       ])
     ]).validate();
   });
 }