Fix warnings_checker.dart handling of multitests

tests/language/deferred_super_dependency_test.dart

Index: tests/language/deferred_super_dependency_test.dart
diff --git a/tests/language/deferred_super_dependency_test.dart b/tests/language/deferred_super_dependency_test.dart
index d2f801fbe21bceb227b595eaba541c89b99390c3..aa42f8da90b2513860d05ce3008a6feba3698131 100644
--- a/tests/language/deferred_super_dependency_test.dart
+++ b/tests/language/deferred_super_dependency_test.dart
@@ -7,9 +7,9 @@
 // used to cause a crash.
 
 import "package:expect/expect.dart";
-import "deferred_super_dependency_lib.dart" deferred as lib; /// 01: static type warning
+import "deferred_super_dependency_lib.dart" deferred as lib; //# 01: static type warning
 
 main() async {
-  await lib.loadLibrary(); /// 01: continued
-  Expect.throws(() => new lib.C().foo(), (e) => e is NoSuchMethodError); /// 01: continued
+  await lib.loadLibrary(); //# 01: continued
+  Expect.throws(() => new lib.C().foo(), (e) => e is NoSuchMethodError); //# 01: continued
 }