It turns out that there were three bugs in the code. Two are simple: a plus sign instead of a dot, as mentioned in Re^2: Number from given digits puzzle, and swapping two variables in the same line, as in Re^3: Number from given digits puzzle. The third problem however seems to be a bug in the perl interpreter about handling closures. They say that the bug is fixed from perl 5.9.0.

Just mentioning a variable at the right point like this makes the problem disappear: 

            poss(mask($v, $m), mask($s, $m), sub {
                my $unused = $f; # <------
                my($v1, $s1) = @_;
                for my $k (0 .. @vv2 - 1) {
                    poss2($v1, $vv2[$k], $s1, $ss2[$k], sub {
                        my($v3, $s3) = @_;
                        &$f($v3, $s3);
                    });
                }
            });

[download]

In reply to Re: Number from given digits puzzle by ambrus
in thread Number from given digits puzzle by ambrus

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.