From: "NARUSE, Yui" Date: 2018-12-15T22:13:56+09:00 Subject: [ruby-core:90547] Ruby 2.6.0-rc2 Released We are pleased to announce the release of Ruby 2.6.0-rc2. Ruby 2.6.0-rc2 is the second release candidate of Ruby 2.6.0. RC2 is released to test bundled Bundler 1.17 instead of 2.0. It introduces some new features and performance improvements, for example: ## 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-rc2, we achieved 1.7x faster performance than Ruby 2.5 on CPU-intensive non-trivial benchmark workload called Optcarrot . 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::AbstractSyntaxTree [Experimental] Ruby 2.6 introduces `RubyVM::AbstractSyntaxTree` 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::AbstractSyntaxTree::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][[Feature #14606]](https://bugs.ruby-lang.org/issues/14606) * 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) * add the oneshot mode [[Feature#15022]](https://bugs.ruby-lang.org/issues/15022) * This mode checks "whether each line was executed at least once or not", instead of "how many times each line was executed". A hook for each line is fired at most once, and after it is fired the hook flag is removed, i.e., it runs with zero overhead. * Add `:oneshot_lines` keyword argument to Coverage.start. * Add `:stop` and `:clear` keyword arguments to Coverage.result. If `clear` is true, it clears the counters to zero. If `stop` is true, it disables coverage measurement. * Coverage.line_stub, which is a simple helper function that creates the "stub" of line coverage from a given source code. * `FileUtils#cp_lr`. [[Feature #4189]](https://bugs.ruby-lang.org/issues/4189) ## 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]](https://bugs.ruby-lang.org/issues/14858) [[Feature #14989]](https://bugs.ruby-lang.org/issues/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) * Supported Unicode version is updated to 11. It is planed to update 12 and 12.1 in future TEENY releases of Ruby 2.6. * Merge RubyGems 3.0.0.beta3. `--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_rc2/NEWS) or [commit logs](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_rc2) for details. With those changes, [6411 files changed, 228864 insertions(+), 97600 deletions(-)](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_rc2) since Ruby 2.5.0! Enjoy programming with Ruby 2.6.0-rc2! ## Download * SIZE: 16723556 bytes SHA1: a4d7f8c8c3584a60fe1a57d03d80162361fe3c78 SHA256: 9c0245e96379246040f1fd0978f8e447e7f47cdccbdaffdb83302a995276b62b SHA512: 789f608f93db6e12835911f3105d9abe2fabb67cd22dc3bafdff38716ac56974925738e7f7788ebef5bdf67b6fd91f84a4ee78a3e5d072cfc8ee0972de737b08 * SIZE: 20643747 bytes SHA1: c1a2898949d929dd952880f1c1c2bac2ef2609b4 SHA256: e8a446cf1f2ffc14483604de0a5e12c2578dd2f672ae87798ca2bbb9b7b73899 SHA512: 2d06feae13f485f5da59574672b14d03881ed532d652648f94e2435f5d81df623b5ef532b8ba8e0b9bc4ee6baf7c0328a5610eab753a9020a0fea2673254c76c * SIZE: 14581998 bytes SHA1: 94bbee97de4955e67effb7f512c58300617a3a09 SHA256: b3d03e471e3136f43bb948013d4f4974abb63d478e8ff7ec2741b22750a3ec50 SHA512: 9bfbe83fd3699b71bae2350801d8c967eb128e79b62a9d36fc0f011b83c53cab28a280939f4cc9f0a28f9bf02dce8eea30866ca4d06480dc44289400abf580ba * SIZE: 11908088 bytes SHA1: 13a7f06d832dc28989e3e4321490a6ba528ed023 SHA256: d620b3d87b3190867304067f3ce77f5305f7ec1b2e73b09c17710c97c028986d SHA512: a3dc43c0bc70dfdb9ff0d18b5b9797bbf332524f5d3bbb7940cf4e32286ca715808acfd11ebf3cdbe358a2466b7c6b5be3a7a784af7eb95c071fe1f8b4ab1261 Unsubscribe: