$ perl -MO=Deparse -e 'use v5.36; sub ONE () { 1 } if (ONE) { print ONE if ONE }'
sub BEGIN {
    require v5.36;
    ()
}
use warnings;
use strict;
no feature ':all';
use feature ':5.36';
sub ONE () {
    1;
}
if (ONE) {
    print ONE() if ONE;
}
-e syntax OK