You can always refer to any variable with all its braces: 

$$foo
${ $foo } # same thing

my $bar = 'baz';
print "$barquux"; # error
print "${bar}quux";

[download]

update: added second example

Remember: Ne dederis in spiritu molere illegitimi!

In reply to Re: Dereferencing of built-ins with crappy names by 1nickt
in thread Dereferencing of built-ins with crappy names by hurricup

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