Create binstubs for executables when activating a package.

sdk/lib/_internal/pub_generated/test/global/binstubs/missing_script_test.dart

Index: sdk/lib/_internal/pub_generated/test/global/binstubs/missing_script_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/global/binstubs/missing_script_test.dart b/sdk/lib/_internal/pub_generated/test/global/binstubs/missing_script_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3fed17cf64a652f93b9dcb9e26bca129d9d8cb00
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/global/binstubs/missing_script_test.dart
@@ -0,0 +1,24 @@
+import 'package:scheduled_test/scheduled_stream.dart';
+import '../../../lib/src/exit_codes.dart' as exit_codes;
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  integration("errors if an executable's script can't be found", () {
+    d.dir("foo", [d.pubspec({
+        "name": "foo",
+        "executables": {
+          "missing": "not_here",
+          "nope": null
+        }
+      })]).create();
+    var pub = startPub(args: ["global", "activate", "-spath", "../foo"]);
+    pub.stderr.expect(
+        'Warning: Executable "missing" runs '
+            '"bin/not_here.dart", which was not found in foo.');
+    pub.stderr.expect(
+        'Warning: Executable "nope" runs "bin/nope.dart", which '
+            'was not found in foo.');
+    pub.shouldExit();
+  });
+}