Fix warnings_checker.dart handling of multitests

tests/language/enum_duplicate_test.dart

Index: tests/language/enum_duplicate_test.dart
diff --git a/tests/language/enum_duplicate_test.dart b/tests/language/enum_duplicate_test.dart
index ad0665a2fda6ec2c09734067c23b5290dc4033b6..29c35f8f4abce2e334b5a5c97e6cefeeb09f8c80 100644
--- a/tests/language/enum_duplicate_test.dart
+++ b/tests/language/enum_duplicate_test.dart
@@ -8,8 +8,8 @@ library enum_duplicate_test;
 
 import 'package:expect/expect.dart';
 
-import 'enum_duplicate_lib.dart' as lib; /// 01: ok
-import 'enum_duplicate_lib.dart' as lib; /// 02: ok
+import 'enum_duplicate_lib.dart' as lib; //# 01: ok
+import 'enum_duplicate_lib.dart' as lib; //# 02: ok
 
 enum Enum1 {
   A,
@@ -23,9 +23,9 @@ enum Enum2 {
 
 main() {
   Expect.equals('Enum1.A,Enum1.B', Enum1.values.join(','));
-  Expect.equals('Enum1.A,Enum1.B', lib.Enum1.values.join(',')); /// 01: continued
+  Expect.equals('Enum1.A,Enum1.B', lib.Enum1.values.join(',')); //# 01: continued
   Expect.equals('Enum2.A,Enum2.B', Enum2.values.join(','));
-  Expect.equals('Enum2.A,Enum2.B', lib.Enum2.values.join(',')); /// 02: continued
+  Expect.equals('Enum2.A,Enum2.B', lib.Enum2.values.join(',')); //# 02: continued
 }