Fix warnings_checker.dart handling of multitests

tests/language/type_promotion_logical_and_test.dart

Index: tests/language/type_promotion_logical_and_test.dart
diff --git a/tests/language/type_promotion_logical_and_test.dart b/tests/language/type_promotion_logical_and_test.dart
index 1ee6296060742c2ec1282cb3af01bd2bc91a4a90..eaf29150218ca9d696fa6be827e6f8d98dbfd046 100644
--- a/tests/language/type_promotion_logical_and_test.dart
+++ b/tests/language/type_promotion_logical_and_test.dart
@@ -27,14 +27,14 @@ void main() {
   A a = new E();
   var b;
   if (a is D && ((a = new D()) != null)) {
-    b = a.d; /// 01: static type warning
+    b = a.d; //# 01: static type warning
   }
   if (a is D && (b = a.d)) {
-    b = a.d; /// 02: static type warning
+    b = a.d; //# 02: static type warning
     a = null;
   }
   if ((((a) is D) && (b = (a).d))) {
-    b = a.d; /// 03: static type warning
+    b = a.d; //# 03: static type warning
     a = null;
   }
   if (f(a = null) && a is D) {