[ruby-core:71450] Ruby 2.3.0-preview1 Released

Hi,

We are pleased to announce the release of Ruby 2.3.0-preview1.

Ruby 2.3.0-preview1 is the first preview of Ruby 2.3.0.
Many new features and improvements are included.

[Frozen String Literal
Pragma](https://bugs.ruby-lang.org/issues/11473) is introduced. On
Ruby 2.1, "str".freeze is optimized to reduce object allocation. Ruby
2.3 introduces new magic comment and command line option to specify
all the 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.

[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.

[did_you_mean.gem is
bundled](https://bugs.ruby-lang.org/issues/11252). did_you_mean.gem
show the candidates on the NameError and NoMethodError to ease
debbugging.

Try and enjoy programming with Ruby 2.3.0-preview1, and report us your
knowledge!

## Notable Changes since 2.2
* TBD

See [NEWS](https://github.com/ruby/ruby/blob/v2_3_0_preview1/NEWS) and
[ChangeLog](https://github.com/ruby/ruby/blob/v2_3_0_preview1/ChangeLog)
for detail.

With those changes, 1036 files changed, 81312 insertions(+), 51322
deletions(-) since Ruby 2.2.0.

## Download

* <http://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview1.tar.bz2>
  * SIZE:   14174035 bytes
  * SHA1:   55ad4f04d7a33ab780458ee0999de9f6124217ea
  * SHA256: 42b9c9e1740a5abe2855d11803524370bd95744c8dcb0068572ed5c969ac7f0f
  * SHA512: ae6d46c87f59e1fd3703b76dfc45bfcf208625f95ab9f4559f0b9f7050e8681f1a6e419f5fa06b704c83e56879c3a9ff1337dba443bcfca76fadb49c97d97a93
* <http://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview1.tar.gz>
  * SIZE:   17560800 bytes
  * SHA1:   6249572e5dca27d8c73a0cbf036e24e5d88fe82f
  * SHA256: dc8f9d48392a2bb226df5f4b4fd2074d81af155cdf3f3799139a6e31e012aefe
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* <http://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview1.tar.xz>
  * SIZE:   11225228 bytes
  * SHA1:   85b4f631efa4b6435b2b41df6ce6c46da294c4d4
  * SHA256: a88e19d9dc001db8f49ca3986a8a4e69980affff876854585725e40de0eedcd8
  * SHA512: 3be0f3ed4de73509b2f6975fe3fbe28bb4d51df87db6e2c0019e8a107edf49be60b2127ba5b18bca91f9f5964b07f1adde3042dac6327017359eeb130760672b
* <http://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](http://bugs.ruby-lang.org/projects/ruby-trunk/wiki/ReleaseEngineering23)


-- 
NARUSE, Yui  <[e-mail]>