It appears this policy fails to detect undeclared subs that are given directly to `print` or single-arg `printf`. The policy fails to detect anything wrong here: ```perl use strict; use warnings; print foo(); printf foo(); ``` However, these are detected ok ```perl print {*STDERR} foo(); printf('%s', foo()); say foo(); ``` Version: `This is perl 5, version 26, subversion 1 (v5.26.1) built for x86_64-linux-multi`