#!/usr/bin/env perl

# Copyright (c) 2015 Christian Jaeger, copying@christianjaeger.ch
# This is free software. See the file COPYING.md that came bundled
# with this file.

use strict; use warnings; use warnings FATAL => 'uninitialized';

sub foo {
    local *f= sub {
        my ($n)= @_;
        #f($n); # works, endless recursion.
        #my $f= \&f; # does not work on either v5.14.2 or bleadperl
        my $f= *f{CODE}; # neither does this (both give undef)
        sub {
            if ($n > 0) {
                $n + &{&$f($n - 1)}
            } else {
                0
            }
        }
    };
    f(@_);
}

my $res= &{foo 2};

print $res,"\n";

