Fix warnings_checker.dart handling of multitests

tests/language/bad_named_parameters2_test.dart

Index: tests/language/bad_named_parameters2_test.dart
diff --git a/tests/language/bad_named_parameters2_test.dart b/tests/language/bad_named_parameters2_test.dart
index 76334b99920df21a489ede81d1f450d3e13541fc..371f2383b4c77dd87d2943123b25dc71015a26c2 100644
--- a/tests/language/bad_named_parameters2_test.dart
+++ b/tests/language/bad_named_parameters2_test.dart
@@ -22,11 +22,11 @@ class BadNamedParameters2Test {
     try {
       caught = false;
       // No formal parameter named b.
-      np.foo(b:25); // /// 01: static type warning
+      np.foo(b:25); // //# 01: static type warning
     } on NoSuchMethodError catch (e) {
       caught = true;
     }
-    Expect.equals(true, caught); /// 01: continued
+    Expect.equals(true, caught); //# 01: continued
   }
 }