There will be backwards compatibility, so us 'old timers' of perl5 will be happy. However, I suspect that if implemented, the first few 6.0.x releases will be solving a lot of problems with breaking the old code, thanks to how this RFC suggests that "//" and "=~" will be treated. Most interesting, "=~" appears to be more general, and will take the lhs arguement, use it as the 'next' arguement on the rhs, then set the rhs result back to the variable on the lhs, much like =+ and friends. Eg (as the RFC gives): 
@array =~ sort { $a <=> $b };
#eqivalent to:
# @array = sort { $a <=> $b } @array;

[download]
But I agree with tye that subst and substr are too dang close and are going to cause more problems than this RFC alone. "Sub" or "subs" might be good enough, but that's up to the Perl 6 committee.
Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain

In reply to Re: Perl 6 RFCs by Masem
in thread Perl 6 RFCs by z0d

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.