Fix warnings_checker.dart handling of multitests

tests/language/field_decl_missing_var_type_test.dart

Index: tests/language/field_decl_missing_var_type_test.dart
diff --git a/tests/language/field_decl_missing_var_type_test.dart b/tests/language/field_decl_missing_var_type_test.dart
index 7b659f96ae1598e3db263ec2222b7bd99fc8b6f8..d6e004fe78f684f9732a292c74a04ea2021a1e85 100644
--- a/tests/language/field_decl_missing_var_type_test.dart
+++ b/tests/language/field_decl_missing_var_type_test.dart
@@ -7,9 +7,9 @@
 // generate a compile-time error.
 
 class A {
-  _this; //                     /// 01: compile-time error
-  A(x) : this._this = x; //     /// 01: continued
+  _this; //                     //# 01: compile-time error
+  A(x) : this._this = x; //     //# 01: continued
 }
 main() {
-  new A(0); //                  /// 01: continued
+  new A(0); //                  //# 01: continued
 }