This is a really weird problem. I have been trying to use eval to generate hashnames at runtime and it hasn't been working properly - it sees package variables but not lexically scoped variables that are declared outside the current function. However, if I reference the lexical then it seems to see it. Here's an example. The following shows an empty array: 
my $code = 'use Data::Dumper; print Dumper \%serial_of;';
eval $code;

[download]
However, this next code shows two copies of the hash correctly; 
use Data::Dumper; print Dumper \%serial_of;
my $code = 'use Data::Dumper; print Dumper \%serial_of;';
eval $code;

[download]
Any other reference to the hash also seems to let eval see it correctly. Obviously this is a problem since if I knew the names of the hashes in advance, I wouldn't need to use eval in the first place. This code is being run in conjunction with Damian Conway's Class::Std module, which may or may not make a difference (if it does, I don't see how).

In reply to Eval doesn't see lexicals by Anonymous Monk

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.