@CommandDefault
static struct S
{
@ArgPositional
int num;
}
alias Info = commandInfoFor!S;
enum Param = Info.positionalArgs[0];
S s;
assert(ArgBinder!().bind!Param("256", s).isOk);
assert(s.num == 256);
assert(!ArgBinder!().bind!Param("two five six", s).isOk);