Fix warnings_checker.dart handling of multitests

tests/language/factory6_test.dart

Index: tests/language/factory6_test.dart
diff --git a/tests/language/factory6_test.dart b/tests/language/factory6_test.dart
index ce30c65fd40a019cca0f9956c4b4ca70943e1188..3d06b0d408d8d47c172f206303a6e27d0bb4a1d5 100644
--- a/tests/language/factory6_test.dart
+++ b/tests/language/factory6_test.dart
@@ -5,13 +5,13 @@
 import 'package:expect/expect.dart';
 
 abstract class Link<T> {
-  factory Link.Foo() = LinkFactory<T>.Foo; // /// 00: static type warning
+  factory Link.Foo() = LinkFactory<T>.Foo; // //# 00: static type warning
 }
 
 class LinkFactory<T> {
-  factory LinkFactory.Foo() = Foo<T>; // /// 00: continued
+  factory LinkFactory.Foo() = Foo<T>; // //# 00: continued
 }
 
 main() {
-  Expect.throws(() => new Link<int>.Foo()); /// 00: continued
+  Expect.throws(() => new Link<int>.Foo()); //# 00: continued
 }