Fix warnings_checker.dart handling of multitests

tests/language/const_evaluation_test.dart

Index: tests/language/const_evaluation_test.dart
diff --git a/tests/language/const_evaluation_test.dart b/tests/language/const_evaluation_test.dart
index acfb66aef30ae0f8f0b5d5b6d78e606f8a7707fd..fafbb213217708318369616379c90555668f2de2 100644
--- a/tests/language/const_evaluation_test.dart
+++ b/tests/language/const_evaluation_test.dart
@@ -38,9 +38,9 @@ class C {
     Expect.equals(instance_var, local_const);
     Expect.equals(local_const, local_final);
     Expect.equals(local_final, local_var);
-    var metadata = reflectClass(C).metadata[0].reflectee; /// 01: ok
-    Expect.equals(top_const, metadata); //                  /// 01: continued
-    Expect.equals(local_var, metadata); //                  /// 01: continued
+    var metadata = reflectClass(C).metadata[0].reflectee; //# 01: ok
+    Expect.equals(top_const, metadata); //                  //# 01: continued
+    Expect.equals(local_var, metadata); //                  //# 01: continued
   }
 }