Fix warnings_checker.dart handling of multitests

tests/language_strong/illegal_initializer_test.dart

Index: tests/language_strong/illegal_initializer_test.dart
diff --git a/tests/language_strong/illegal_initializer_test.dart b/tests/language_strong/illegal_initializer_test.dart
index 1158f23ab4528fa0e7bbd0da845972baf8fa4bac..de993c4aaf467735c7e3e2adc27ce6a543464542 100644
--- a/tests/language_strong/illegal_initializer_test.dart
+++ b/tests/language_strong/illegal_initializer_test.dart
@@ -9,29 +9,29 @@ class A {
 
 class B extends A {
   B.c1() : super.foo
-  /* // /// 01: compile-time error
+  /* // //# 01: compile-time error
   ()
-  */ // /// 01: continued
+  */ // //# 01: continued
   ;
 
   B.foo();
   B.c2() : this.foo
-  /* // /// 02: compile-time error
+  /* // //# 02: compile-time error
   ()
-  */ // /// 02: continued
+  */ // //# 02: continued
   ;
 
   B.c3() : super
-  /* // /// 03: compile-time error
+  /* // //# 03: compile-time error
   ()
-  */ // /// 03: continued
+  */ // //# 03: continued
   ;
 
   B();
   B.c4() : this
-  /* // /// 04: compile-time error
+  /* // //# 04: compile-time error
   ()
-  */ // /// 04: continued
+  */ // //# 04: continued
   ;
 }