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Copy file name to clipboardExpand all lines: en/news/_posts/2018-12-15-ruby-2-6-0-rc2-released.md
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---
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layout: news_post
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title: "Ruby 2.6.0-rc1 Released"
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title: "Ruby 2.6.0-rc2 Released"
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author: "naruse"
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translator:
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date: 2018-12-06 00:00:00 +0000
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date: 2018-12-15 00:00:00 +0000
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lang: en
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---
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We are pleased to announce the release of Ruby 2.6.0-rc1.
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We are pleased to announce the release of Ruby 2.6.0-rc2.
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Ruby 2.6.0-rc1 is the first release candidate of Ruby 2.6.0.
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Ruby 2.6.0-rc2 is the second release candidate of Ruby 2.6.0.
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RC2 is released to test bundled Bundler 1.17 instead of 2.0.
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It introduces some new features and performance improvements, for example:
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## JIT
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The main purpose of this JIT release is to provide a chance to check if it works for your platform and to find out security risks before the 2.6 release.
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JIT compiler is supported when Ruby is built by GCC, Clang, or Microsoft VC++, which needs to be available on runtime. Otherwise you can't use it for now.
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As of Ruby 2.6.0-rc1, we achieved 1.7x faster performance than Ruby 2.5 on CPU-intensive non-trivial benchmark workload called Optcarrot <https://gist.github.com/k0kubun/d7f54d96f8e501bbbc78b927640f4208>. We're going to improve the performance on memory-intensive workload like Rails application as well.
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As of Ruby 2.6.0-rc2, we achieved 1.7x faster performance than Ruby 2.5 on CPU-intensive non-trivial benchmark workload called Optcarrot <https://gist.github.com/k0kubun/d7f54d96f8e501bbbc78b927640f4208>. We're going to improve the performance on memory-intensive workload like Rails application as well.
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Stay tuned for the new age of Ruby's performance.
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* Add a new alias `then` to `Kernel#yield_self`. [[Feature #14594]](https://bugs.ruby-lang.org/issues/14594)
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*`else` without `rescue` now causes a syntax error. [EXPERIMENTAL]
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*`else` without `rescue` now causes a syntax error. [EXPERIMENTAL][[Feature #14606]](https://bugs.ruby-lang.org/issues/14606)
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* constant names may start with a non-ASCII capital letter. [[Feature #13770]](https://bugs.ruby-lang.org/issues/13770)
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* Merge [Bundler](https://github.com/bundler/bundler) as Default gems.
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See [NEWS](https://github.com/ruby/ruby/blob/v2_6_0_rc1/NEWS)
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or [commit logs](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_rc1)
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See [NEWS](https://github.com/ruby/ruby/blob/v2_6_0_rc2/NEWS)
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or [commit logs](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_rc2)
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