5 use Test::More tests => 2;
9 is join("", sort xs_cmp split//, '1415926535'), '1135559246',
10 'sort treats XS cmp routines as having implicit ($$)';
13 local $SIG{__WARN__} = sub { $w .= shift };
14 () = sort xs_cmp_undef 1,2;
15 like $w, qr/^Use of uninitialized value in sort at /,
16 'warning about undef retval from cmp routine mentions sort';