I'm trying to parse the usage infos in the pod of perlfunc to create code snippets, and am getting surprised by idiosyncrasies.

For instance is eof magic when called with empty brackets eof()

but has a prototype

$ perl
print prototype 'CORE::eof',"\n"
__END__
;*
$
[download]

See also perlsub

> Note however that some built-ins can't have their syntax expressed by a prototype (such as system or chomp). If you override them you won't be able to fully mimic their original syntax.