I think this is possible, however my solution is cryptic and ugly, but it works. I recommend you to copy-paste the following snippets to a syntax-highlighting editor, otherwise you will get lost. Let's start with an easier version that still uses a variable for holding a coderef to an anonymous sub, later on we will eliminate it. 
#! /usr/bin/perl

use strict;
use warnings;

my $f = sub {
  return @_ == 1
    ? undef
    : ( [ splice @_, -2 ], @_ == 1 ? () : &{ $_[0] }(@_) );
};
map { print "$_->[0] -> $_->[1]\n" }
  $f->( $f, %{ { x => 5, y => 8, z => 42 } } );

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A little explanation: I'm defining a recursive anonymous sub, that gets its coderef as its first argument, and the hash listified as the following arguments. Then returns undef for the recursion base case (@_==1), or returns an arrayref for its last two args, and calls itself for the remaining args (if there are enough remaining args). Okay, try it, the result is this: 
z -> 42
x -> 5
y -> 8

[download]
Then eliminate the var for the coderef: replace the occurances of $f in the map statement with the former sub{} definition and we get this: 
#! /usr/bin/perl

use strict;
use warnings;

map { print "$_->[0] -> $_->[1]\n" } &{
  sub {
    return @_ == 1
      ? undef
      : ( [ splice @_, -2 ], @_ == 1 ? () : &{ $_[0] }(@_) );
    }
  }(
  sub {
    return @_ == 1
      ? undef
      : ( [ splice @_, -2 ], @_ == 1 ? () : &{ $_[0] }(@_) );
  },
  %{ { x => 5, y => 8, z => 42 } }
  );

[download]
I'm sure you don't want to use this in real code, however this shows the idea. And sorry but I cannot see any easier solution at this moment.

In reply to Re: Iterating over verbatim hash reference by rubasov
in thread Iterating over verbatim hash reference by rovf

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