Fix warnings_checker.dart handling of multitests

tests/language_strong/cyclic_type_variable_test.dart

Index: tests/language_strong/cyclic_type_variable_test.dart
diff --git a/tests/language_strong/cyclic_type_variable_test.dart b/tests/language_strong/cyclic_type_variable_test.dart
index 79c2937cfc99a13bb01b15d55efc5fed11e319c0..a6d6118c999735e26d6aa90ffac52bfd8008d066 100644
--- a/tests/language_strong/cyclic_type_variable_test.dart
+++ b/tests/language_strong/cyclic_type_variable_test.dart
@@ -9,14 +9,14 @@ class Base<T> {}
 class Derived extends Base<Derived> {}  // legal
 
 typedef void funcType<T
-extends T /// 01: static type warning
+extends T //# 01: static type warning
 >(T arg);
 
 class DerivedFunc extends Base<funcType<DerivedFunc>> { }
 
 
 abstract class A<S
-extends S /// 02: static type warning
+extends S //# 02: static type warning
 > {
   S field;
 }
@@ -26,13 +26,13 @@ abstract class B<U extends Base<U>> { // legal
 }
 
 class C1<V
-extends V // /// 03: static type warning
+extends V // //# 03: static type warning
 > {
   V field;
 }
 
 class C2<V
-extends V // /// 04: static type warning
+extends V // //# 04: static type warning
 > implements A<V> {
   V field;
 }