Make pub's binstubs resilient to changes in snapshot format.

sdk/lib/_internal/pub_generated/test/cache/repair/handles_orphaned_binstub_test.dart

Index: sdk/lib/_internal/pub_generated/test/cache/repair/handles_orphaned_binstub_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/cache/repair/handles_orphaned_binstub_test.dart b/sdk/lib/_internal/pub_generated/test/cache/repair/handles_orphaned_binstub_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..56f48ad2e636f53398363a5d9351c150ede47966
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/cache/repair/handles_orphaned_binstub_test.dart
@@ -0,0 +1,36 @@
+// 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:scheduled_test/scheduled_test.dart';
+
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+
+const _ORPHANED_BINSTUB = """
+#!/usr/bin/env sh
+# This file was created by pub v0.1.2-3.
+# Package: foo
+# Version: 1.0.0
+# Executable: foo-script
+# Script: script
+dart "/path/to/.pub-cache/global_packages/foo/bin/script.dart.snapshot" "\$@"
+""";
+
+main() {
+  initConfig();
+  integration('handles an orphaned binstub script', () {
+    d.dir(
+        cachePath,
+        [d.dir('bin', [d.file(binStubName('script'), _ORPHANED_BINSTUB)])]).create();
+
+    schedulePub(
+        args: ["cache", "repair"],
+        error: allOf(
+            [
+                contains('Binstubs exist for non-activated packages:'),
+                contains('From foo: foo-script')]));
+  });
+}