Fix warnings_checker.dart handling of multitests

tests/language_strong/constructor_duplicate_initializers_test.dart

Index: tests/language_strong/constructor_duplicate_initializers_test.dart
diff --git a/tests/language_strong/constructor_duplicate_initializers_test.dart b/tests/language_strong/constructor_duplicate_initializers_test.dart
index 9748beec1c7f0693fb9ea442692d42fd1426860a..ed01c1674bf9a84d0b8b4200742c79d7534608be 100644
--- a/tests/language_strong/constructor_duplicate_initializers_test.dart
+++ b/tests/language_strong/constructor_duplicate_initializers_test.dart
@@ -8,16 +8,16 @@ class Class {
   Class(var v)
     : field_ = v
       // Test against duplicate final field initializaion in initializing list.
-    , field_ = 2 // /// 01: compile-time error
+    , field_ = 2 // //# 01: compile-time error
   ;
   Class.field(this.field_)
       // Test against duplicate final field initialization between initializing
       // formals and initializer list.
-    : field_ = 2 // /// 02: compile-time error
+    : field_ = 2 // //# 02: compile-time error
   ;
   // Test against duplicate final field initialization in initializing formals.
   Class.two_fields(this.field_
-    , this.field_ /// 03: compile-time error
+    , this.field_ //# 03: compile-time error
   );
   final field_;
 }
@@ -26,6 +26,6 @@ main() {
   new Class(42);
   new Class.field(42);
   new Class.two_fields(42
-    , 42 //  /// 03: continued
+    , 42 //  //# 03: continued
   );
 }