All,
Every now and then I try to think of ideas for Obfuscated code. I seldom follow through, but it is often a great learning exercise. Consider the following code: 
#!/usr/bin/perl
use strict;
use warnings;

sub jump {
    my $place = 'START';
    goto $place;
}
START:
print "Hello, world\n";
jump();

[download]
As you might expect, this creates an infinite loop. I wondered what might happen if $place were a tied variable that instead of fetching a value - did a goto elsewhere. Would the original goto ever get called? 
#!/usr/bin/perl
use strict;
use warnings;

sub jump {
    tie my $place, 'main';
    goto $place;    
}
START:
print "Hello, world\n";
jump();
print "I am jumping over this spot\n";
END:
print "Goodbye, cruel world\n";

sub TIESCALAR { bless {}, $_[0] }
sub STORE     { print "Read only\n"; }
sub FETCH     { goto END; }

[download]
This dies yelling about Can't find label END at ... First, I know that Perl supports goto label out of a sub as demonstrated by the first snippet. Second, I can't find anything in goto docs that would suggest this shouldn't work. Can anyone shed some light?

Cheers - L~R

In reply to Mixing tied variables with goto label by Limbic~Region

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.