[WIP] Ruby 2.5.0-preview1 Released

Author: nurse

en/news/_posts/2017-09-18-ruby-2-5-0-preview1-released.md

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+---
+layout: news_post
+title: "Ruby 2.5.0-preview1 Released"
+author: "naruse"
+translator:
+date: 2017-09-18 00:00:00 +0000
+lang: en
+---
+
+We are pleased to announce the release of Ruby 2.5.0-preview1.
+
+Ruby 2.5.0-preview1 is the first preview release toward Ruby 2.5.0.
+It introduces some new features and performance improvements, for example:
+
+## New Features
+
+* Print backtrace and error message in reverse order if STDERR is unchanged and a tty.
+  [Feature #8661] [experimental]
+
+* Top-level constant look-up is removed.  [Feature #11547]
+
+* rescue/else/ensure are allowed inside do/end blocks.  [Feature #12906]
+
+
+* yield\_self [Feature #6721]
+* absent operator
+  https://github.com/k-takata/Onigmo/issues/82
+
+## Other notable changes since 2.3
+
+* RDoc: Merge rdoc-6.0.0.beta2 from upstream.
+  This version changed lexer used Ripper from lexer based IRB,
+  and it much improved the performance of generating document.
+  see details: https://github.com/ruby/rdoc/pull/512
+
+See [NEWS](https://github.com/ruby/ruby/blob/v2_5_0/NEWS)
+or commit logs for details.
+
+With those changes,
+[2523 files changed, 289129 insertions(+), 84670 deletions(-)](https://github.com/ruby/ruby/compare/v2_4_0...v2_5_0)
+since Ruby 2.4.0!
+
+Enjoy Ruby 2.5.0-preview1!
+
+## Download
+

ja/news/_posts/2017-09-18-ruby-2-5-0-preview1-released.md

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+---
+layout: news_post
+title: "Ruby 2.5.0-preview1 リリース"
+author: "naruse"
+translator:
+date: 2017-09-18 00:00:00 +0000
+lang: ja
+---
+
+Ruby 2.5.0にむけたの最初のプレビューである、Ruby 2.4.0-preview1がリリースされました。
+
+Ruby 2.5.0 では以下に示すようなたくさんの新機能が含まれています:
+
+## ...
+
+
+## Performance improvements
+
+Ruby 2.5 では以下のような言語レベルでの修正を伴う性能改善が行われています。
+
+### ...
+
+
+
+### Other performance improvements
+
+
+## Debugging
+
+
+## Other notable changes since 2.4
+
+* RDoc
+
+See also [NEWS](https://github.com/ruby/ruby/blob/v2_5_0/NEWS).
+
+With those changes,
+
+
+
+## Download
+