Fix warnings_checker.dart handling of multitests

tests/language_strong/callable_test.dart

Index: tests/language_strong/callable_test.dart
diff --git a/tests/language_strong/callable_test.dart b/tests/language_strong/callable_test.dart
index ede87fc470471d0dbdcc378d5772757160e70ab8..ede9fa499344356f0590a153674a702472f63e9a 100644
--- a/tests/language_strong/callable_test.dart
+++ b/tests/language_strong/callable_test.dart
@@ -36,8 +36,8 @@ main() {
   Y y = new Y();
   Function g = y;  // Should pass checked mode test
   F f0 = y;  // Should pass checked mode test
-  F f1 = x; /// 00: dynamic type error, static type warning
-  G g0 = y; /// 01: dynamic type error, static type warning
+  F f1 = x; //# 00: dynamic type error, static type warning
+  G g0 = y; //# 01: dynamic type error, static type warning
 
   Expect.equals(f(), 42);
   Expect.equals(g(100), 187);