use strict;
use warnings; # Comment out unless 5.6+

package Bar;

use vars qw/ $AUTOLOAD /;

sub new { bless {}, shift };

sub AUTOLOAD {
    print "AUTOLOAD: @_ : $AUTOLOAD\n";

    my $self = shift;
    die "'$self' is not an object\n" unless ref($self);

    print "Doing some AUTOLOAD'ing magic\n";
}

sub DESTROY {}

sub frobnitz {
    my $foo = new Foo ( input => { } );
}

package Foo;

sub new { bless {}, shift };

package main;

my $bar = Bar->new;
$bar->frobnitz;

##</code><code>##

my $foo = new Foo ( input => { } );

##</code><code>##

my $foo = Foo->new( input => { } );

##</code><code>##

my $foo = new Foo ( input => { } );

##</code><code>##

my $foo = new(Foo('input', {}));