Fix warnings_checker.dart handling of multitests

tests/language_strong/regress_22976_test.dart

Index: tests/language_strong/regress_22976_test.dart
diff --git a/tests/language_strong/regress_22976_test.dart b/tests/language_strong/regress_22976_test.dart
index 67d69570b3f775d24e480c763b501f95d4f29786..d2081cd149e824f5d4ac745cbcccf5c53ebd8ad6 100644
--- a/tests/language_strong/regress_22976_test.dart
+++ b/tests/language_strong/regress_22976_test.dart
@@ -9,6 +9,6 @@ class B<T> implements A<T> {}
 class C<S, T> implements B<S>, A<T> {}
 
 main() {
-  A<int> a0 = new C<int, String>(); /// 01: ok
-  A<int> a1 = new C<String, int>(); /// 02: ok
+  A<int> a0 = new C<int, String>(); //# 01: ok
+  A<int> a1 = new C<String, int>(); //# 02: ok
 }