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225 строки
7.1 KiB
Markdown
225 строки
7.1 KiB
Markdown
# NEWS for Ruby 3.4.0
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This document is a list of user-visible feature changes
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since the **3.3.0** release, except for bug fixes.
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Note that each entry is kept to a minimum, see links for details.
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## Language changes
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* String literals in files without a `frozen_string_literal` comment now emit a deprecation warning
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when they are mutated.
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These warnings can be enabled with `-W:deprecated` or by setting `Warning[:deprecated] = true`.
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To disable this change, you can run Ruby with the `--disable-frozen-string-literal`
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command line argument. [[Feature #20205]]
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* `it` is added to reference a block parameter. [[Feature #18980]]
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* Keyword splatting `nil` when calling methods is now supported.
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`**nil` is treated similarly to `**{}`, passing no keywords,
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and not calling any conversion methods. [[Bug #20064]]
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* Block passing is no longer allowed in index assignment
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(e.g. `a[0, &b] = 1`). [[Bug #19918]]
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* Keyword arguments are no longer allowed in index assignment
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(e.g. `a[0, kw: 1] = 2`). [[Bug #20218]]
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* GC.config added to allow setting configuration variables on the Garbage
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Collector. [[Feature #20443]]
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* GC configuration parameter `rgengc_allow_full_mark` introduced. When `false`
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GC will only mark young objects. Default is `true`. [[Feature #20443]]
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## Core classes updates
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Note: We're only listing outstanding class updates.
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* Exception
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* Exception#set_backtrace now accepts arrays of Thread::Backtrace::Location.
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Kernel#raise, Thread#raise and Fiber#raise also accept this new format. [[Feature #13557]]
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* Range
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* Range#size now raises TypeError if the range is not iterable. [[Misc #18984]]
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* Range#step now consistently has a semantics of iterating by using `+` operator
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for all types, not only numerics. [[Feature #18368]]
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```ruby
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(Time.utc(2022, 2, 24)..).step(24*60*60).take(3)
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#=> [2022-02-24 00:00:00 UTC, 2022-02-25 00:00:00 UTC, 2022-02-26 00:00:00 UTC]
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```
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* RubyVM::AbstractSyntaxTree
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* Add RubyVM::AbstractSyntaxTree::Node#locations method which returns location objects
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associated with the AST node. [[Feature #20624]]
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* Add RubyVM::AbstractSyntaxTree::Location class which holds location information. [[Feature #20624]]
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* Fiber::Scheduler
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* An optional `Fiber::Scheduler#blocking_region` hook allows blocking operations to be moved out of the event loop
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in order to reduce latency and improve multi-core processor utilization. [[Feature #20855]]
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## Stdlib updates
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* Tempfile
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* The keyword argument `anonymous: true` is implemented for Tempfile.create.
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`Tempfile.create(anonymous: true)` removes the created temporary file immediately.
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So applications don't need to remove the file.
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[[Feature #20497]]
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* win32/sspi.rb
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* This library is now extracted from the Ruby repository to [ruby/net-http-sspi].
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[[Feature #20775]]
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The following default gem is added.
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* win32-registry 0.0.1
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The following default gems are updated.
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* RubyGems 3.6.0.dev
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* bundler 2.6.0.dev
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* date 3.4.0
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* erb 4.0.4
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* etc 1.4.4
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* fiddle 1.1.5.dev
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* fileutils 1.7.3
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* io-console 0.7.2
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* ipaddr 1.2.7
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* irb 1.14.1
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* json 2.8.0.alpha1
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* logger 1.6.1
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* net-http 0.4.1
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* optparse 0.5.0
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* prism 1.0.0
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* psych 5.2.0.beta1
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* rdoc 6.7.0
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* reline 0.5.10
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* resolv 0.4.0
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* stringio 3.1.2.dev
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* strscan 3.1.1.dev
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* syntax_suggest 2.0.1
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* time 0.4.0
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* uri 0.13.1
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* win32ole 1.9.0
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* zlib 3.1.1
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The following bundled gem is added.
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* repl_type_completor 0.1.7
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The following bundled gems are updated.
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* minitest 5.25.1
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* power_assert 2.0.4
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* rake 13.2.1
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* test-unit 3.6.2
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* rexml 3.3.9
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* rss 0.3.1
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* net-ftp 0.3.8
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* net-imap 0.5.0
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* net-smtp 0.5.0
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* rbs 3.6.1
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* typeprof 0.21.11
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* debug 1.9.2
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* racc 1.8.1
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The following bundled gems are promoted from default gems.
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* mutex_m 0.2.0
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* getoptlong 0.2.1
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* base64 0.2.0
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* bigdecimal 3.1.8
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* observer 0.1.2
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* abbrev 0.1.2
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* resolv-replace 0.1.1
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* rinda 0.2.0
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* drb 2.2.1
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* nkf 0.2.0
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* syslog 0.1.2
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* csv 3.3.0
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See GitHub releases like [GitHub Releases of Logger] or changelog for
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details of the default gems or bundled gems.
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[ruby/net-http-sspi]: https://github.com/ruby/net-http-sspi
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[GitHub Releases of Logger]: https://github.com/ruby/logger/releases
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## Supported platforms
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## Compatibility issues
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* Error messages and backtrace displays have been changed.
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* Use a single quote instead of a backtick as an opening quote. [[Feature #16495]]
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* Display a class name before a method name (only when the class has a permanent name). [[Feature #19117]]
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* Kernel#caller, Thread::Backtrace::Location’s methods, etc. are also changed accordingly.
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Old:
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```
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test.rb:1:in `foo': undefined method `time' for an instance of Integer
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from test.rb:2:in `<main>'
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```
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New:
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```
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test.rb:1:in 'Object#foo': undefined method 'time' for an instance of Integer
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from test.rb:2:in '<main>'
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```
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* Hash#inspect rendering have been changed. [[Bug #20433]]
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* Symbol keys are displayed using the modern symbol key syntax: `"{user: 1}"`
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* Other keys now have spaces around `=>`: `'{"user" => 1}'`, while previously they didn't: `'{"user"=>1}'`
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## Stdlib compatibility issues
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## C API updates
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* `rb_newobj` and `rb_newobj_of` (and corresponding macros `RB_NEWOBJ`, `RB_NEWOBJ_OF`, `NEWOBJ`, `NEWOBJ_OF`) have been removed. [[Feature #20265]]
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* Removed deprecated function `rb_gc_force_recycle`. [[Feature #18290]]
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## Implementation improvements
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* Array#each is rewritten in Ruby for better performance [[Feature #20182]].
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## JIT
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## Miscellaneous changes
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* Passing a block to a method which doesn't use the passed block will show
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a warning on verbose mode (`-w`).
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[[Feature #15554]]
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* Redefining some core methods that are specially optimized by the interpreter
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and JIT like String#freeze or Integer#+ now emits a performance class
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warning (`-W:performance` or `Warning[:performance] = true`).
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[[Feature #20429]]
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[Feature #13557]: https://bugs.ruby-lang.org/issues/13557
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[Feature #15554]: https://bugs.ruby-lang.org/issues/15554
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[Feature #16495]: https://bugs.ruby-lang.org/issues/16495
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[Feature #18290]: https://bugs.ruby-lang.org/issues/18290
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[Feature #18368]: https://bugs.ruby-lang.org/issues/18368
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[Feature #18980]: https://bugs.ruby-lang.org/issues/18980
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[Misc #18984]: https://bugs.ruby-lang.org/issues/18984
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[Feature #19117]: https://bugs.ruby-lang.org/issues/19117
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[Bug #19918]: https://bugs.ruby-lang.org/issues/19918
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[Bug #20064]: https://bugs.ruby-lang.org/issues/20064
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[Feature #20182]: https://bugs.ruby-lang.org/issues/20182
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[Feature #20205]: https://bugs.ruby-lang.org/issues/20205
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[Bug #20218]: https://bugs.ruby-lang.org/issues/20218
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[Feature #20265]: https://bugs.ruby-lang.org/issues/20265
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[Feature #20429]: https://bugs.ruby-lang.org/issues/20429
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[Bug #20433]: https://bugs.ruby-lang.org/issues/20433
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[Feature #20443]: https://bugs.ruby-lang.org/issues/20443
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[Feature #20497]: https://bugs.ruby-lang.org/issues/20497
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[Feature #20624]: https://bugs.ruby-lang.org/issues/20624
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[Feature #20775]: https://bugs.ruby-lang.org/issues/20775
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[Feature #20855]: https://bugs.ruby-lang.org/issues/20855
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