sub can {
	my ($self, $what, $code) = (@_[0,1], undef);
	return $code if $code = $self->UNIVERSAL::can($what);
	return $code if $code = $self->_can($what);
	foreach my $superclass (@ISA) {
		return $code if $code = eval "\$self->${superclass}::can(\$what)";
	}
	return undef;
}

sub _can { # aka _load()
	my ($self, $what) = @_;
	if ($what eq 'foo') {
		return sub {'foo'};
	} else {
		return undef;
	}
}

sub AUTOLOAD {
	my ($self, $code) = ($_[0], undef);
	goto &$code if $code = $self->can($AUTOLOAD);
	die "oops";
}