Fix warnings_checker.dart handling of multitests

tests/language/missing_const_constructor_test.dart

Index: tests/language/missing_const_constructor_test.dart
diff --git a/tests/language/missing_const_constructor_test.dart b/tests/language/missing_const_constructor_test.dart
index 14b18d7b66879d16164f05c6dfdeb2b9db504d93..166c529099e6d43751456872bc12cffd5e952eff 100644
--- a/tests/language/missing_const_constructor_test.dart
+++ b/tests/language/missing_const_constructor_test.dart
@@ -9,21 +9,21 @@ class GoodClass {
 }
 
 GoodClass GOOD_CLASS
-    = const GoodClass() /// 01: ok
-    = const GoodClass.BAD_NAME() /// 02: compile-time error
-    = const GoodClass("bad arg") /// 03: compile-time error
+    = const GoodClass() //# 01: ok
+    = const GoodClass.BAD_NAME() //# 02: compile-time error
+    = const GoodClass("bad arg") //# 03: compile-time error
 ;
 
 
-const BadClass BAD_CLASS = const BadClass(); /// 04: compile-time error
-BadClass BAD_CLASS = const BadClass(); /// 05: compile-time error
+const BadClass BAD_CLASS = const BadClass(); //# 04: compile-time error
+BadClass BAD_CLASS = const BadClass(); //# 05: compile-time error
 
 void main() {
   try {
     print(GOOD_CLASS);
-    print(BAD_CLASS); /// 04: continued
-    print(BAD_CLASS); /// 05: continued
-    print(const BadClass()); /// 06: compile-time error
+    print(BAD_CLASS); //# 04: continued
+    print(BAD_CLASS); //# 05: continued
+    print(const BadClass()); //# 06: compile-time error
   } catch (e) {
 
   }