Fix warnings_checker.dart handling of multitests

tests/language/malbounded_instantiation_test.dart

Index: tests/language/malbounded_instantiation_test.dart
diff --git a/tests/language/malbounded_instantiation_test.dart b/tests/language/malbounded_instantiation_test.dart
index 78ace6a297885adfeb9cbbb05912c05eb65bd58f..6e725ef9bbbef33aa5579a92323d89435434bbe0 100644
--- a/tests/language/malbounded_instantiation_test.dart
+++ b/tests/language/malbounded_instantiation_test.dart
@@ -5,11 +5,11 @@
 import 'package:expect/expect.dart';
 
 class Super<T extends num> {}
-class Malbounded1 implements Super<String> {} // /// 01: static type warning
-class Malbounded2 extends Super<String> {} // /// 02: static type warning
+class Malbounded1 implements Super<String> {} // //# 01: static type warning
+class Malbounded2 extends Super<String> {} // //# 02: static type warning
 
 main() {
-  new Malbounded1(); // /// 01: static type warning
-  new Malbounded2(); // /// 02: static type warning, dynamic type error
-  new Super<String>(); // /// 03: static type warning, dynamic type error
+  new Malbounded1(); // //# 01: static type warning
+  new Malbounded2(); // //# 02: static type warning, dynamic type error
+  new Super<String>(); // //# 03: static type warning, dynamic type error
 }