It seems quite bizarre that this works...

use v5.14;
use strict;
use warnings FATAL => qw(all);

package :::::::: {
    sub x { printf "(%s)\n",  __PACKAGE__ };
}
::::::::::x ();

[download]
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Perl allows package names consisting entirely of colons by tobyink

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