Joseph Jones liked your message with Boxer. On December 10, 2015 at 18:40:14 MST, NARUSE, Yui <naruse@airemix.jp> wrote:We are pleased to announce the release of Ruby 2.3.0-preview2.Ruby 2.3.0-preview2 is the second 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 tofreeze 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`--debug=frozen-string-literal` command line option.A [safe navigation operator](https://bugs.ruby-lang.org/issues/11537)([so-called lonely operator](https://instagram.com/p/-M9l6mRPLR/)) `&.`,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 gemshows the candidates on the `NameError` and `NoMethodError` to easedebugging.[RubyVM::InstructionSequence#to_binary and .load_from_binary](https://bugs.ruby-lang.org/issues/11788) are introduced asexperimental feature. With these features, we can make a ISeq(bytecode) pre-compilation system.Ruby 2.3 includes many performance tuning fixes.For example, [optimize Proc#call] (https://bugs.ruby-lang.org/issues/11569),[reconsider method entry data structure](https://bugs.ruby-lang.org/issues/11278),[introducing new table data structure](https://bugs.ruby-lang.org/issues/11420),machine code level tuning for object allocation and method calling code,and other many optimizations.Try and enjoy programming with Ruby 2.3.0-preview2, and report us yourknowledge!## Notable Changes since 2.2See [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, [1097 files changed, 97466 insertions(+), 58685deletions(-)](https://github.com/ruby/ruby/compare/v2_2_0...v2_3_0_preview2)since Ruby 2.2.0!## Download*  * SIZE: 14126752 bytes * SHA1: 7e717ef7a0a1523ad696b5fe693f7f7a613a3810 * SHA256: e9b0464e50b2e5c31546e6b8ca8cad71fe2d2146ccf88b7419bbe9626af741cb * SHA512: e397f321d4338edba8d005d871408775f03d975da90c8abcfdb457a1bc7e6c87efe58c53b2c3bc122e9f58f619767b271bcc8d5d9663ed4b4288c60556e8d288*  * SIZE: 17623519 bytes * SHA1: 2deaf3ccbbfc5e08d3d840a4f1c33ff5f62f931d * SHA256: cb1c745bda33ba9e812b48c87852571ef6486f985c5e6ff4508a137d1c9734a3 * SHA512: 83022f99775eb139beec281d59029dcc7c59de1e313182685b0a785334ac53d0c445212460d00d065169b922949263f30a1f981e19fc6e59814e79e6e53ae8e0*  * SIZE: 11249780 bytes * SHA1: e1dfca06cd3c2cf6456a7feb0b1cd0752bde1a3b * SHA256: 7c3119268af87c137f415301b299281762453ad78f86e35562be014dabd67b11 * SHA512: ab3376145d95a2188e6345984f0e5592c8d33515d7046a2ab2565dc418fa2306cdcf797aae9494d4d10446ada54ba638d8a8ad2d4b7510544d7eaea3de4faa87*  * SIZE: 19841531 bytes * SHA1: db7fa5291d90e0a9c6f75c0cd068bc54050520d6 * SHA256: 90d036fd1ec40aa8f5493821ac162bf69f505c5977db54afe53b8bf689d79b9d * SHA512: 05784df420018aaae7d09d41e872df708e861cacc74dc8ee97a9e3ac7458cb12b937523ad6def34d5ae2890a0cf037a8d61e365beb88d28acd84879b9391ad65## Release CommentSee also the release schedule and other information:[ReleaseEngineering23](https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/ReleaseEngineering23)-- NARUSE, Yui