use feature qw(declared_refs) doesn't seem to make sense without the other feature.

Yes, but the refaliasing does make sense without declared_refs, so it's possible that refaliasing could be accepted without declared_refs.

Upd: Removed incorrect claim once present here. Bad test.

Use of refalising and declared_refs: 
$ perl -M5.022 -e'
   my $x = 123; \my $y = \$x; say $y;
'
Experimental aliasing via reference not enabled at -e line 2.

$ perl -M5.022 -e'
   use feature qw( refaliasing );
   my $x = 123; \my $y = \$x; say $y;
'
Aliasing via reference is experimental at -e line 3.
123

$ perl -M5.022 -e'
   use feature qw( refaliasing );
   no warnings qw( experimental::refaliasing );
   my $x = 123; \my $y = \$x; say $y;
'
123

$ perl -M5.022 -e'
   use experimental qw( refaliasing );
   my $x = 123; \my $y = \$x; say $y;
'
123

[download]
$ perl -M5.026 -e'
   my $x = 123; my \$y = \$x; say $y;
'
The experimental declared_refs feature is not enabled at -e line 2.

$ perl -M5.026 -e'
   use feature qw( declared_refs );
   my $x = 123; my \$y = \$x; say $y;
'
Declaring references is experimental at -e line 3.
Experimental aliasing via reference not enabled at -e line 3.

$ perl -M5.026 -e'
   use feature qw( refaliasing declared_refs );
   my $x = 123; my \$y = \$x; say $y;
'
Declaring references is experimental at -e line 3.
Aliasing via reference is experimental at -e line 3.
123

$ perl -M5.026 -e'
   use feature qw( refaliasing declared_refs );
   no warnings qw( experimental::refaliasing experimental::declared_re
+fs );
   my $x = 123; my \$y = \$x; say $y;
'
123

$ perl -M5.026 -e'
   use experimental qw( refaliasing declared_refs );
   my $x = 123; my \$y = \$x; say $y;
'
123

[download]

Upd: Dropped requirement to 5.22 for refaliasing part.

In reply to Re: POD for use feature 'declared_refs' wrong by ikegami
in thread POD for use feature 'declared_refs' wrong by LanX

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.