Seems to work only when the colons come in pairs:

#! perl
use strict;
use warnings;

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

package main;

:::::::x();

[download]

Produces:

23:01 >perl 405_Obfu.pl
Bareword "::::::" refers to nonexistent package at 405_Obfu.pl line 27
+.
Invalid version format (non-numeric data) at 405_Obfu.pl line 17, near
+ "package ::::"
syntax error at 405_Obfu.pl line 17, near "package :::::"
Execution of 405_Obfu.pl aborted due to compilation errors.

23:02 >

[download]
“Curiouser and curiouser!” cried Alice.

Update: D’oh! (slaps forehead). Of course! :: is a synonym for main, and so is ::main and therefore ::::, likewise ::::::, etc., etc. (See Packages.) This “insight” is wrong — see reply by tobyink, below.

Athanasius <°(((>< contra mundum

In reply to Re: Perl allows package names consisting entirely of colons by Athanasius
in thread Perl allows package names consisting entirely of colons by tobyink

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