Fix warnings_checker.dart handling of multitests

tests/language/syncstar_yield_test.dart

Index: tests/language/syncstar_yield_test.dart
diff --git a/tests/language/syncstar_yield_test.dart b/tests/language/syncstar_yield_test.dart
index 80485b9d19f4ca1217626f6a5d6d97f3a92b7237..c134c7176883b88c814b5c4d6b826c6d3460faf3 100644
--- a/tests/language/syncstar_yield_test.dart
+++ b/tests/language/syncstar_yield_test.dart
@@ -40,15 +40,15 @@ main() {
       foo2(4).take(10).toList());
   Iterable t = foo3(0);
   Iterator it1 = t.iterator;
-  Iterator it2 = t.iterator; /// copyParameters: ok
+  Iterator it2 = t.iterator; //# copyParameters: ok
   it1.moveNext();
-  it2.moveNext(); /// copyParameters: continued
+  it2.moveNext(); //# copyParameters: continued
   Expect.equals(2, it1.current);
   // TODO(sigurdm): Check up on the spec here.
-  Expect.equals(2, it2.current); // /// copyParameters: continued
+  Expect.equals(2, it2.current); // //# copyParameters: continued
   Expect.isFalse(it1.moveNext());
   // Test that two `moveNext()` calls are fine.
   Expect.isFalse(it1.moveNext());
-  Expect.isFalse(it2.moveNext()); /// copyParameters: continued
-  Expect.isFalse(it2.moveNext()); /// copyParameters: continued
+  Expect.isFalse(it2.moveNext()); //# copyParameters: continued
+  Expect.isFalse(it2.moveNext()); //# copyParameters: continued
 }