I can't think of an example where an old function was deprecated, because that would cause old code to break. Do you have an example of this?

See perldeprecation, and though some of the features may seem obscure, I do believe that they caused some breakages. As I recall, P5P did proceed quite carefully for each of them, checking breakages on CPAN etc. Also, they've generally fallen into two categories: One, things that have been deprecated for ages (e.g. $* and $# are documented as "Deprecated in Perl 5. Removed in Perl v5.10.0.", but weren't fatal until 5.30), or two, changes to make room for new syntax in the future (e.g. the notes for "Some formerly deprecated uses of an unescaped left brace "{" in regular expression patterns are now illegal" in 5.30 state "... will enable the Perl language to be extended in various ways in future releases."). Update: I guess a third category would be experiments that were removed - perlexperiment.

In reply to Re^2: How Perl revolve by haukex
in thread How should Perl revolve? by xiaoyafeng

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.