$ perl -MO=Deparse -e '$x = anything_could_go_here::'
$x = 'anything_could_go_here';
-e syntax OK


##</code><code>##

q{}
''
=>
::
qw{}
- (as in -bareword)


##</code><code>##

no strict;
$x = bareword;


##</code><code>##

"" and qq{}
`` and qx{}