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$ perl -Mstrict -Mwarnings -E '
    my %A = (a => 1, b => 2, D => 3);
...
    say for "@{[sort keys %all_keys]}";
'
D a b y z

$ perl -Mstrict -Mwarnings -E '
    my %A = (a => 1, b => 2, D => 3);
...
    say for "@{[sort keys %all_keys]}";
'
D a b y z

$ perl -Mstrict -Mwarnings -MO=Deparse -E '
    my %A = (a => 1, b => 2, D => 3);
...
@(\my %all_keys){keys %A, keys %Z} = ();
say $_ foreach (join $", @{[sort(keys %all_keys)];});
-e syntax OK

$ perl -Mstrict -Mwarnings -MO=Deparse -E '
    my %A = (a => 1, b => 2, D => 3);
...
@all_keys{keys %A, keys %Z} = ();
say $_ foreach (join $", @{[sort(keys %all_keys)];});
-e syntax OK

$ perl -v | head -2 | tail -1
This is perl 5, version 39, subversion 3 (v5.39.3) built for cygwin-th
+read-multi

$ perl -v | head -2 | tail -1
This is perl 5, version 30, subversion 0 (v5.30.0) built for cygwin-th
+read-multi

use feature 'current_sub', 'bitwise', 'evalbytes', 'fc', 'postderef_qq
+', 'say', 'state', 'switch', 'unicode_strings', 'unicode_eval';