Fix warnings_checker.dart handling of multitests

tests/language/assign_top_method_test.dart

Index: tests/language/assign_top_method_test.dart
diff --git a/tests/language/assign_top_method_test.dart b/tests/language/assign_top_method_test.dart
index 63df040f6d8ff94d5835de94b0961583a3b59dba..e7dfc27f793b17a3d2cc088a80c22da6a94008e9 100644
--- a/tests/language/assign_top_method_test.dart
+++ b/tests/language/assign_top_method_test.dart
@@ -8,6 +8,6 @@ method() { return 0; }
 
 main() {
   // Illegal, can't change a top level method
-  Expect.throws(() { method = () { return 1; }; }, // /// 01: static type warning
-                (e) => e is NoSuchMethodError); //    /// 01: continued
+  Expect.throws(() { method = () { return 1; }; }, // //# 01: static type warning
+                (e) => e is NoSuchMethodError); //    //# 01: continued
 }