cp {en,ko}/news/_posts/2018-11-06-ruby-2-6-0-preview3-released.md

Author: riseshia

ko/news/_posts/2018-11-06-ruby-2-6-0-preview3-released.md

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+---
+layout: news_post
+title: "Ruby 2.6.0-preview3 Released"
+author: "naruse"
+translator:
+date: 2018-11-06 00:00:00 +0000
+lang: en
+---
+
+We are pleased to announce the release of Ruby 2.6.0-preview3.
+
+Ruby 2.6.0-preview3 is the third preview toward Ruby 2.6.0.
+This preview3 is released to test new features before coming Release Candidate.
+
+## JIT
+
+Ruby 2.6 introduces an initial implementation of JIT (Just-in-time) compiler.
+
+JIT compiler aims to improve performance of any Ruby program execution.
+Unlike ordinary JIT compilers for other languages, Ruby's JIT compiler does JIT compilation in a unique way, which prints C code to a disk and spawns common C compiler process to generate native code.
+See also: [MJIT organization by Vladimir Makarov](https://github.com/vnmakarov/ruby/tree/rtl_mjit_branch#mjit-organization).
+
+How to use: Just specify `--jit` in command line or `$RUBYOPT` environment variable.
+Specifying `--jit-verbose=1` allows to print basic information of ongoing JIT compilation. See `ruby --help` for other options.
+
+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.
+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.
+
+As of Ruby 2.6.0 preview3, 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.
+
+Stay tuned for the new age of Ruby's performance.
+
+## RubyVM::AST [Experimental]
+
+Ruby 2.6 introduces `RubyVM::AST` module.
+
+This module has `parse` method which parses a given ruby code of string and returns AST (Abstract Syntax Tree) nodes, and `parse_file` method which parses a given ruby code file and returns AST nodes.
+`RubyVM::AST::Node` class is also introduced. You can get location information and children nodes from `Node` objects. This feature is experimental. Compatibility of the structure of AST nodes are not guaranteed.
+
+## New Features
+
+* Add a new alias `then` to `Kernel#yield_self`. [[Feature #14594]](https://bugs.ruby-lang.org/issues/14594)
+
+* `else` without `rescue` now causes a syntax error.  [EXPERIMENTAL]
+
+* constant names may start with a non-ASCII capital letter. [[Feature #13770]](https://bugs.ruby-lang.org/issues/13770)
+
+* endless range [[Feature #12912]](https://bugs.ruby-lang.org/issues/12912)
+
+  An endless range, `(1..)`, is introduced. It works as it has no end. This shows typical use cases:
+
+      ary[1..]                          # identical to ary[1..-1] without magical -1
+      (1..).each {|index| ... }         # inifinite loop from index 1
+      ary.zip(1..) {|elem, index| ... } # ary.each.with_index(1) { ... }
+
+* Add `Binding#source_location`.  [[Feature #14230]](https://bugs.ruby-lang.org/issues/14230)
+
+  This method returns the source location of binding, a 2-element array of `__FILE__` and `__LINE__`.  Traditionally, the same information could be retrieved by `eval("[__FILE__, __LINE__]", binding)`, but we are planning to change this behavior so that `Kernel#eval` ignores binding's source location [[Bug #4352]](https://bugs.ruby-lang.org/issues/4352).  So, users should use this newly-introduced method instead of `Kernel#eval`.
+
+* Add `:exception` option to let `Kernel.#system` raise error instead of returning `false`.  [[Feature #14386]](https://bugs.ruby-lang.org/issues/14386)
+
+## Performance improvements
+
+* Speedup `Proc#call` because we don't need to care about `$SAFE` any more.
+  [[Feature #14318]](https://bugs.ruby-lang.org/issues/14318)
+
+  With `lc_fizzbuzz` benchmark which uses `Proc#call` so many times we can measure
+  x1.4 improvements [[Bug #10212]](https://bugs.ruby-lang.org/issues/10212).
+
+* Speedup `block.call` where `block` is passed block parameter. [[Feature #14330]](https://bugs.ruby-lang.org/issues/14330)
+
+  Ruby 2.5 improves block passing performance. [[Feature #14045]](https://bugs.ruby-lang.org/issues/14045)
+  Additionally, Ruby 2.6 improves the performance of passed block calling.
+  With micro-benchmark we can observe x2.6 improvement.
+
+* Transient Heap (theap) is introduced. [Bug #14858] [Feature #14989]
+  theap is managed heap for short-living memory objects which are pointed by
+  specific classes (Array, Hash, Object, and Struct). For example, making small
+  and short-living Hash object is x2 faster. With rdoc benchmark, we observed
+  6-7% performance improvement.
+
+## Other notable changes since 2.5
+
+* `$SAFE` is a process global state and we can set `0` again.  [[Feature #14250]](https://bugs.ruby-lang.org/issues/14250)
+
+* Passing `safe_level` to `ERB.new` is deprecated. `trim_mode` and `eoutvar` arguments are changed to keyword arguments. [[Feature #14256]](https://bugs.ruby-lang.org/issues/14256)
+
+* Merge RubyGems 3.0.0.beta2. `--ri` and `--rdoc` options was removed. Please use `--document` and `--no-document` options instead of them.
+
+* Merge [Bundler](https://github.com/bundler/bundler) as Default gems.
+
+See [NEWS](https://github.com/ruby/ruby/blob/v2_6_0_preview3/NEWS)
+or [commit logs](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_preview3)
+for details.
+
+With those changes,
+[6474 files changed, 171888 insertions(+), 46617 deletions(-)](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_preview3)
+since Ruby 2.5.0!
+
+Enjoy programming with Ruby 2.6.0-preview3!
+
+## Download
+
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-preview3.tar.gz>
+
+      SIZE:   17071670 bytes
+      SHA1:   67836fda11fa91e0b988a6cc07989fbceda025b4
+      SHA256: 60243e3bd9661e37675009ab66ba63beacf5dec748885b9b93916909f965f27a
+      SHA512: 877278cd6e9b947f5bb6ed78136efb232dcc9c5c218b7236576171e7c3cd7f6b7d10d07d8402014a14aba1fcd1913a4370f0725c561ead41d8a3fe92029f7f76
+
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-preview3.zip>
+
+      SIZE:   21537655 bytes
+      SHA1:   45f3c90dfffe03b746f21f24152666e361cbb41a
+      SHA256: 9152af9e700349dcfa2eec196dd91587d42d70a6837fa2c415ebba1167587be1
+      SHA512: 335de36cf56706326f4acc4bbd35be01e0ac5fff30d0a69b2e1630ba4c78f0e711822d1623d0099a517c824b154917d2f60be192dfb143a422cf1d17b38e1183
+
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-preview3.tar.bz2>
+
+      SIZE:   14973451 bytes
+      SHA1:   5f2df5d8c5a3888ccb915d36a3532ba32cda8791
+      SHA256: 1f09a2ac1ab26721923cbf4b9302a66d36bb302dc45e72112b41d6fccc5b5931
+      SHA512: d1693625723796e8902f3e4c4fae444f2912af9173489f7cf18c99db2a217afc971b082fce7089e39f8edd54d762d2b4e72843c8306ed29b05ccb15ac03dbb5b
+
+* <https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.0-preview3.tar.xz>
+
+      SIZE:   12291692 bytes
+      SHA1:   7f8216247745215e9645568e7a02140f9a029b31
+      SHA256: 9856d9e0e32df9e5cdf01928eec363d037f1a76dab2abbf828170647beaf64fe
+      SHA512: b4d3b17ecf96272c43cd7518c0b54dee63fc1150ad143e1d9c9d708506fe78676c80eb96cc47b8d46d1128bd483a53f16c944963a03d1f99f00131b74714df7b