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    system $system_cmd
        or die "Could not $system_cmd: $!";

    my $package = caller->{package};
    my $file    = caller->{file};
    my $line    = caller->{line};
  
  
=head1 DESCRIPTION

Several of the builtins in Perl 6 have different (i.e. more useful, less
confusing) behaviours than their Perl 5 counterparts. This module provides
Perl 5 versions of those builtins.


=head1 INTERFACE 

=over 

=item C<system>

If C<system> is loaded on the use line, the builtin is altered so that it
returns true if the system command suceeds. In any other context, the command
returns the value in C<$!>.

=item C<caller>

If C<caller> is loaded on the use line, the builtin is altered so that it
behaves as in Perl 5 in scalar and list contexts. However, if the result of a 
call to C<caller> is used as a hash reference it returns a reference to a
hash with the following keys:

=over

=item 'package'

=item 'file'

=item 'line'

=item 'sub'

=item 'args'

=item 'want'

=item 'eval'

=item 'require'

=item 'hints'

=item 'bitmask'

=back

with each of the values for these keys being the equivalent item from
the list returned by C<caller> in list context. This is useful because
it means that, instead of:

    $subname = (caller)[3];

you can write the much more readable:

    $subname = caller->{sub};

=back

=head1 DIAGNOSTICS

None.

=head1 CONFIGURATION AND ENVIRONMENT

Perl6::Builtins requires no configuration files or environment variables.


=head1 DEPENDENCIES

This module uses the Contextual::Return module.


=head1 INCOMPATIBILITIES

None reported.


=head1 BUGS AND LIMITATIONS

No bugs have been reported.

Please report any bugs or feature requests to
C<bug-perl6-builtins@rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org>.


=head1 AUTHOR

Damian Conway  C<< <DCONWAY@cpan.org> >>


=head1 LICENCE AND COPYRIGHT

Copyright (c) 2005, Damian Conway C<< <DCONWAY@cpan.org> >>. All rights reserved.

This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.


=head1 DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR, OR CORRECTION.