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use feature 'switch';
no warnings 'experimental';
...
    $data = io();
}
1;

% perl t.pl 
Undefined subroutine &test::io called at t.pl line 11.

$data = IO::All::io()

Can't call method "_package" on an undefined value at /usr/share/perl5
+/vendor_perl/IO/All.pm line 63.