Because that's what Rubinius non-X is for. This is about an experimental Ruby-based language that has the freedom to make breaking changes. It's not just another implementation of Ruby, it's about creating a new language that learns from Ruby and other languages. I expect that we'll see some of these ideas percolate back to Ruby proper, and others will be created and/or wither on their merits within Rubinius X, so long as it remains experimental.
All that said, this simplifies the language spec and implementation by eliminating features that have long been on-the-outs in the Ruby community. Note that the proposals on that page don't break regexes, they just break code that uses the old Perl-esque $1, etc. magic variables. This is almost mechanically trivial to port to use Regexp methods, MatchData, etc. IME, it's rare to see this used in Ruby code in the wild. I find it kind of startling when it does show up.
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Because that's what Rubinius non-X is for. This is about an experimental Ruby-based language that has the freedom to make breaking changes. It's not just another implementation of Ruby, it's about creating a new language that learns from Ruby and other languages. I expect that we'll see some of these ideas percolate back to Ruby proper, and others will be created and/or wither on their merits within Rubinius X, so long as it remains experimental.
All that said, this simplifies the language spec and implementation by eliminating features that have long been on-the-outs in the Ruby community. Note that the proposals on that page don't break regexes, they just break code that uses the old Perl-esque $1, etc. magic variables. This is almost mechanically trivial to port to use Regexp methods, MatchData, etc. IME, it's rare to see this used in Ruby code in the wild. I find it kind of startling when it does show up.