perlver doesn't notice postderef unless it's explicitly called out

[pryrt]

After reading this perlmonks post, I did some investigating, and narrowed it down to 3 separate bugs or feature requests, which I'm raising as three separate issues.

For postfix dereferencing, 'use feature qw(postderef);' was required when it was new in v5.20, but since v5.24, you are not required to explicitly use that feature any more: it is on and works by default.

Hence, in v5.24 or newer, the following is valid code, but if you tried to run it before v5.24, it would not work:

code: implicit_postderef.pl

#!/usr/bin/perl

use warnings;
use strict;

$_ = [1];
my @a = $_->@*;
print "@a\n";

Running perlver implicit_postderef.pl yields:

   ----------------------------------------------------
 | file                  | explicit | syntax | external |
 | ---------------------------------------------------- |
 | implicit_postderef.pl | ~        | v5.6.0 | n/a      |
 | ---------------------------------------------------- |
 | Minimum explicit version : ~                             |
 | Minimum syntax version   : v5.6.0                        |
 | Minimum version of perl  : v5.6.0                        |
   ----------------------------------------------------

I would expect it to report that the syntax requires v5.24.0 (or maybe just v5.20.0, since use feature qw(postderef); will allow that syntax to work back to v5.20).

(I did confirm that an explicit 'use feature qw(postderef);' correctly shows v5.20.0 as the minimum version required.)

(verified with perlver v1.40 on Perl 5.32)