In some older versions of perl (like v5.10), I get a warning that:
Use of implicit split to @_ is deprecated at src/test/recovery/t/006_logical_decoding.pl line 26.
Splitting into a dummy variable silences that warning, as in the attached. There may be a better way to silence the warning. (Presumably it actually is clobbering @_ in those older versions of Perl, but that doesn't seem to cause problems in this particular case.)