Fix warnings_checker.dart handling of multitests

tests/corelib_strong/list_test.dart

Index: tests/corelib_strong/list_test.dart
diff --git a/tests/corelib_strong/list_test.dart b/tests/corelib_strong/list_test.dart
index 75d33e98bb07c9b851402b6ab2eabb05bf2102d8..8d6df271327737e0179e6c585493e7b2e350b528 100644
--- a/tests/corelib_strong/list_test.dart
+++ b/tests/corelib_strong/list_test.dart
@@ -582,7 +582,7 @@ class MyFixedList<E> extends ListBase<E> {
 
 void testListConstructor() {
   Expect.throws(() { new List(0).add(4); });  // Is fixed-length.
-  Expect.throws(() { new List(-2); });  // Not negative. /// 01: ok
+  Expect.throws(() { new List(-2); });  // Not negative. //# 01: ok
   Expect.throws(() { new List(null); });  // Not null.
   Expect.listEquals([4], new List()..add(4));
   Expect.throws(() { new List.filled(0, 42).add(4); });  // Is fixed-length.