Fix warnings_checker.dart handling of multitests

tests/language/top_level_getter_no_setter1_test.dart

Index: tests/language/top_level_getter_no_setter1_test.dart
diff --git a/tests/language/top_level_getter_no_setter1_test.dart b/tests/language/top_level_getter_no_setter1_test.dart
index 80b429e4b10a9bccd1b59f0721c375c1071ae3bb..967fde664741e805baa8877891f31e195baee6b7 100644
--- a/tests/language/top_level_getter_no_setter1_test.dart
+++ b/tests/language/top_level_getter_no_setter1_test.dart
@@ -13,12 +13,12 @@ int get getter {
 class Class {
   method() {
     try {
-      getter++; /// 01: static type warning
+      getter++; //# 01: static type warning
     } on NoSuchMethodError catch(e) {
-      Expect.isTrue(getter_visited); /// 01: continued
+      Expect.isTrue(getter_visited); //# 01: continued
       return;
     }
-    Expect.fail('Expected NoSuchMethodError'); /// 01: continued
+    Expect.fail('Expected NoSuchMethodError'); //# 01: continued
   }
 }