Fix warnings_checker.dart handling of multitests

tests/language_strong/inferrer_constructor5_test.dart

Index: tests/language_strong/inferrer_constructor5_test.dart
diff --git a/tests/language_strong/inferrer_constructor5_test.dart b/tests/language_strong/inferrer_constructor5_test.dart
index 37b62f1084d21d860f5d890f8d391354fd92ffd5..7c416f491f58cec18f13f8db21a2a08ec5fbf490 100644
--- a/tests/language_strong/inferrer_constructor5_test.dart
+++ b/tests/language_strong/inferrer_constructor5_test.dart
@@ -6,7 +6,7 @@ import "package:expect/expect.dart";
 
 class A {
   A() {
-    print(field + 42); /// 01: static type warning
+    print(field + 42); //# 01: static type warning
   }
 }
 
@@ -18,5 +18,5 @@ class B extends A {
 }
 
 main() {
-  Expect.throws(() => new B(), (e) => e is NoSuchMethodError); /// 01: continued
+  Expect.throws(() => new B(), (e) => e is NoSuchMethodError); //# 01: continued
 }