The following code produces a circular class hierarchy. (Yes, I know that's a no-no, but that's not the point.) 
#!/usr/bin/perl

use strict;
use warnings;

package aaa; {
    our @ISA = 'bbb';
    sub new { return bless {}, shift; }
}

package bbb; {
    our @ISA = 'aaa';
    sub new { return bless {}, shift; }
}

package main;

my $obj = bbb->new;

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When run, it produces the following error message: 
Recursive inheritance detected while looking for method '()' in package 'bbb'.
From other testing I did, I determined that the method being referred to in the error message is not DESTROY even though the error occurs when the object goes out of scope.

Further, I determined that the method name is not an empty string. Perl is literally looking for a method called '()'.

The question is: Just what is this strange method '()'?


Remember: There's always one more bug.

In reply to What is method () ? by jdhedden

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