Fix warnings_checker.dart handling of multitests

tests/language/switch_bad_case_test.dart

Index: tests/language/switch_bad_case_test.dart
diff --git a/tests/language/switch_bad_case_test.dart b/tests/language/switch_bad_case_test.dart
index 7b9e9997cbb5d07a472c3c4e2b30e839336245df..29c2843d44b39d166355de585c0fbabbe8cba4f1 100644
--- a/tests/language/switch_bad_case_test.dart
+++ b/tests/language/switch_bad_case_test.dart
@@ -19,18 +19,18 @@ caesarSays(n) {
       return "I";
     case 4:
       return "IV";
-    case "M": //        /// 01: compile-time error
-      return 1000; //   /// 01: continued
+    case "M": //        //# 01: compile-time error
+      return 1000; //   //# 01: continued
   }
   return null;
 }
 
 archimedesSays(n) {
-  switch (n) { //       /// 02: continued
-    case 3.14: //       /// 02: compile-time error
-      return "Pi"; //   /// 02: continued
-    case 2.71828: //    /// 02: continued
-      return "Huh?"; // /// 02: continued
-  } //                  /// 02: continued
+  switch (n) { //       //# 02: continued
+    case 3.14: //       //# 02: compile-time error
+      return "Pi"; //   //# 02: continued
+    case 2.71828: //    //# 02: continued
+      return "Huh?"; // //# 02: continued
+  } //                  //# 02: continued
   return null;
 }