Fix warnings_checker.dart handling of multitests

tests/language/dynamic_field_test.dart

Index: tests/language/dynamic_field_test.dart
diff --git a/tests/language/dynamic_field_test.dart b/tests/language/dynamic_field_test.dart
index 5328471aacbf2c0ad070f284bf867a47b4b10491..557c6741f7d03f0445ea2efb44ad875f275c8600 100644
--- a/tests/language/dynamic_field_test.dart
+++ b/tests/language/dynamic_field_test.dart
@@ -13,12 +13,12 @@ class A extends C {
 
 class C {
   foo() {
-    print(a); /// 01: static type warning
-    return a; /// 01: continued
+    print(a); //# 01: static type warning
+    return a; //# 01: continued
   }
   bar() {
-    print(b.a); /// 02: static type warning
-    return b.a; /// 02: continued
+    print(b.a); //# 02: static type warning
+    return b.a; //# 02: continued
   }
 }
 
@@ -26,6 +26,6 @@ main() {
   var a = new A();
   a.a = 1;
   a.b = a;
-  Expect.equals(1, a.foo()); /// 01: continued
-  Expect.equals(1, a.bar()); /// 02: continued
+  Expect.equals(1, a.foo()); //# 01: continued
+  Expect.equals(1, a.bar()); //# 02: continued
 }