Fix warnings_checker.dart handling of multitests

tests/language_strong/instanceof4_test.dart

Index: tests/language_strong/instanceof4_test.dart
diff --git a/tests/language_strong/instanceof4_test.dart b/tests/language_strong/instanceof4_test.dart
index 8a7de67b6c90b7b319182d71408edc56017f034b..4bcfadde8cd2190de364ab6870bd09549de9e054 100644
--- a/tests/language_strong/instanceof4_test.dart
+++ b/tests/language_strong/instanceof4_test.dart
@@ -22,23 +22,23 @@ testFooString() {
   Expect.isTrue(!o.isNotT());
   Expect.isTrue(o.isListT());
   Expect.isTrue(!o.isNotListT());
-  Expect.isTrue(!o.isAlsoListT()); // /// 01: ok
-  Expect.isTrue(o.isNeitherListT()); // /// 01: ok
+  Expect.isTrue(!o.isAlsoListT()); // //# 01: ok
+  Expect.isTrue(o.isNeitherListT()); // //# 01: ok
   for (var i = 0; i < 20; i++) {
     // Make sure methods are optimized.
     o.isT();
     o.isNotT();
     o.isListT();
     o.isNotListT();
-    o.isAlsoListT(); // /// 01: ok
-    o.isNeitherListT(); // /// 01: ok
+    o.isAlsoListT(); // //# 01: ok
+    o.isNeitherListT(); // //# 01: ok
   }
   Expect.isTrue(o.isT(), "1");
   Expect.isTrue(!o.isNotT(), "2");
   Expect.isTrue(o.isListT(), "3");
   Expect.isTrue(!o.isNotListT(), "4");
-  Expect.isTrue(!o.isAlsoListT(), "5"); // /// 01: ok
-  Expect.isTrue(o.isNeitherListT(), "6"); // /// 01: ok
+  Expect.isTrue(!o.isAlsoListT(), "5"); // //# 01: ok
+  Expect.isTrue(o.isNeitherListT(), "6"); // //# 01: ok
 }
 
 testFooInt() {