Fix warnings_checker.dart handling of multitests

tests/language_strong/deferred_type_dependency_test.dart

Index: tests/language_strong/deferred_type_dependency_test.dart
diff --git a/tests/language_strong/deferred_type_dependency_test.dart b/tests/language_strong/deferred_type_dependency_test.dart
index 766834e81b5d916e3c12d7ec426a96473da22c07..c4917cbbd2efab6e2d496d9cdd33c9421679470a 100644
--- a/tests/language_strong/deferred_type_dependency_test.dart
+++ b/tests/language_strong/deferred_type_dependency_test.dart
@@ -13,18 +13,18 @@ main() async {
   await lib1.loadLibrary();
   // Split the cases into a multi-test to test each feature separately.
   Expect.isFalse(
-      lib1.fooIs /// is: ok
-      lib1.fooAs /// as: ok
-      lib1.fooAnnotation /// type_annotation: ok
+      lib1.fooIs //# is: ok
+      lib1.fooAs //# as: ok
+      lib1.fooAnnotation //# type_annotation: ok
       ("string")
-      is! String /// none: ok
+      is! String //# none: ok
   );
   await lib2.loadLibrary();
   Expect.isTrue(
-      lib1.fooIs /// is: ok
-      lib1.fooAs /// as: ok
-      lib1.fooAnnotation /// type_annotation: ok
+      lib1.fooIs //# is: ok
+      lib1.fooAs //# as: ok
+      lib1.fooAnnotation //# type_annotation: ok
       (lib2.getInstance())
-      is! String /// none: ok
+      is! String //# none: ok
   );
 }