Fix warnings_checker.dart handling of multitests

tests/language_strong/deferred_load_constants_test.dart

Index: tests/language_strong/deferred_load_constants_test.dart
diff --git a/tests/language_strong/deferred_load_constants_test.dart b/tests/language_strong/deferred_load_constants_test.dart
index 2d795f431b93ac580083f5e02c132dc929d94a99..f56414c508020c9bc2dec812df5e4a9e871f5c30 100644
--- a/tests/language_strong/deferred_load_constants_test.dart
+++ b/tests/language_strong/deferred_load_constants_test.dart
@@ -24,11 +24,11 @@ main() {
     Expect.identical(toplevel, foo.toplevel);
     Expect.identical(C.staticfun, foo.C.staticfun);
     // Access through deferred prefix is not a constant expression.
-    Expect.throws(() => const [foo.c]); //           /// 01: compile-time error
-    Expect.throws(() => const [foo.C]); //           /// 02: compile-time error
-    Expect.throws(() => const [foo.funtype]); //     /// 03: compile-time error
-    Expect.throws(() => const [foo.toplevel]); //    /// 04: compile-time error
-    Expect.throws(() => const [foo.C.staticfun]); // /// 05: compile-time error
+    Expect.throws(() => const [foo.c]); //           //# 01: compile-time error
+    Expect.throws(() => const [foo.C]); //           //# 02: compile-time error
+    Expect.throws(() => const [foo.funtype]); //     //# 03: compile-time error
+    Expect.throws(() => const [foo.toplevel]); //    //# 04: compile-time error
+    Expect.throws(() => const [foo.C.staticfun]); // //# 05: compile-time error
 
     asyncEnd();
   });