Fix warnings_checker.dart handling of multitests

tests/language/super_no_such_method5_test.dart

Index: tests/language/super_no_such_method5_test.dart
diff --git a/tests/language/super_no_such_method5_test.dart b/tests/language/super_no_such_method5_test.dart
index fba8087b27f0d37b4f18dcd4f03d8500e43ac8d4..3076dc48fd3fb168d538434c8b29bbf1a9cb22ea 100644
--- a/tests/language/super_no_such_method5_test.dart
+++ b/tests/language/super_no_such_method5_test.dart
@@ -9,9 +9,9 @@ class A {
 }
 
 class B extends Object with A {
-  foo() => super.foo(); /// 01: static type warning
+  foo() => super.foo(); //# 01: static type warning
 }
 
 main() {
-  Expect.equals(42, new B().foo()); /// 01: continued
+  Expect.equals(42, new B().foo()); //# 01: continued
 }