use XS::APItest qw(labelconst);
my $z = "";
$z .= labelconst FOO:;
$z .= labelconst BAR:
;
$z .= labelconst BAZ
:;
$z .= labelconst
QUUX:;
$z;
use XS::APItest qw(labelconst);
my $z = "";
$z .= labelconst FOO:;
$z .= labelconst BAR:
;
$z .= labelconst BAZ
:;
$z .= labelconst
QUUX:;
$z;