There are various ways to calculate intermediate values, but then throw them away, in a one-liner:

<ul>
<li><a href="http://www.perlmonks.org/?node_id=287647">my $val = do { ... };</a>
<li><a href="http://search.cpan.org/dist/perl/pod/perlop.pod#Comma_Operator">comma operator</a>
</ul>