Consider: 
class Fustian {
   my $var1;
   has $.a;
   if $?OS ~~ /Windows/ {
       has $.b;
       say “adding Windows support”;
      }
   ...

[download]
and think through what this means. Imagine defining class members in subroutines that are themselves not part of the class!

I'm trying to collect the existing wisdom and then proceed with a design document. Please check out the PDF file or the odt file. I think it's time to nail down some of these details.

—John

In reply to Perl 6 Shocking Revelations II - classes are built, not declared by John M. Dlugosz

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