added news post: Ruby 2.3.0-preview2 Released

Author: nurse

en/news/_posts/2015-11-27-ruby-2-3-0-preview2-released.md

@@ -0,0 +1,80 @@
+---
+layout: news_post
+title: "Ruby 2.3.0-preview2 Released"
+author: "naruse"
+translator:
+date: 2015-11-11 14:00:00 +0000
+lang: en
+---
+
+We are pleased to announce the release of Ruby 2.3.0-preview2.
+
+Ruby 2.3.0-preview2 is the first preview of Ruby 2.3.0.
+Many new features and improvements are included.
+
+A [Frozen String Literal Pragma](https://bugs.ruby-lang.org/issues/11473)
+is introduced.
+With Ruby 2.1, `"str".freeze` has been optimized to reduce object allocation.
+Ruby 2.3 introduces a new magic comment and command line option to
+freeze all string literals in the source files.
+Additionally for debugging, you can get where the object is created on
+`"can't modify frozen String"` error by
+`--enable-frozen-string-literal-debug`.
+
+A [safe navigation operator](https://bugs.ruby-lang.org/issues/11537),
+which already exists in C#, Groovy, and Swift, is introduced to ease
+`nil` handling as `obj&.foo`. `Array#dig` and `Hash#dig` are also added.
+
+The [did_you_mean gem is bundled](https://bugs.ruby-lang.org/issues/11252).
+The did_you_mean gem
+shows the candidates on the `NameError` and `NoMethodError` to ease
+debugging.
+
+Try and enjoy programming with Ruby 2.3.0-preview2, and report us your
+knowledge!
+
+## Notable Changes since 2.2
+
+* TBD
+
+See [NEWS](https://github.com/ruby/ruby/blob/v2_3_0_preview2/NEWS) and
+[ChangeLog](https://github.com/ruby/ruby/blob/v2_3_0_preview2/ChangeLog)
+for detail.
+
+With those changes, [1036 files changed, 81312 insertions(+), 51322 deletions(-)](https://github.com/ruby/ruby/compare/v2_2_0...v2_3_0_preview2) since Ruby 2.2.0!
+
+## Download
+
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview1.tar.bz2>
+
+  * SIZE:   14174035 bytes
+  * SHA1:   55ad4f04d7a33ab780458ee0999de9f6124217ea
+  * SHA256: 42b9c9e1740a5abe2855d11803524370bd95744c8dcb0068572ed5c969ac7f0f
+  * SHA512: ae6d46c87f59e1fd3703b76dfc45bfcf208625f95ab9f4559f0b9f7050e8681f1a6e419f5fa06b704c83e56879c3a9ff1337dba443bcfca76fadb49c97d97a93
+
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview1.tar.gz>
+
+  * SIZE:   17560800 bytes
+  * SHA1:   6249572e5dca27d8c73a0cbf036e24e5d88fe82f
+  * SHA256: dc8f9d48392a2bb226df5f4b4fd2074d81af155cdf3f3799139a6e31e012aefe
+  * SHA512: 58384ef6e743dde20ea263692dab86ce9d6d22d722ef4c02a84396aa3128ce06d933d9b69078a3cd666d72320a8a6ffdc93296bc0d5338595b2a44c29d4db383
+
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview1.tar.xz>
+
+  * SIZE:   11225228 bytes
+  * SHA1:   85b4f631efa4b6435b2b41df6ce6c46da294c4d4
+  * SHA256: a88e19d9dc001db8f49ca3986a8a4e69980affff876854585725e40de0eedcd8
+  * SHA512: 3be0f3ed4de73509b2f6975fe3fbe28bb4d51df87db6e2c0019e8a107edf49be60b2127ba5b18bca91f9f5964b07f1adde3042dac6327017359eeb130760672b
+
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview1.zip>
+
+  * SIZE:   19777010 bytes
+  * SHA1:   3458666c250dd333ac4b537be25f1913dd311ea1
+  * SHA256: 0fc1d4450e9141f541038a4433f8fb49fb929e43c7bf5985685a4fa7b213a811
+  * SHA512: f53653cf11d8dce1d627f7db3a15acca29c74c78735406a5d64bbbdc39fac232ef63110eb4d83521bef40c6f3006d55bbeaf54d1ddab1d4b6e5a13cee9247e85
+
+## Release Comment
+
+See also the release schedule and other information:
+
+[ReleaseEngineering23](https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/ReleaseEngineering23)