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# NEWS for Ruby 3.4.0
This document is a list of user-visible feature changes
since the **3.3.0** release, except for bug fixes.
Note that each entry is kept to a minimum, see links for details.
## Language changes
* String literals in files without a `frozen_string_literal` comment now emit a deprecation warning
when they are mutated.
These warnings can be enabled with `-W:deprecated` or by setting `Warning[:deprecated] = true`.
To disable this change, you can run Ruby with the `--disable-frozen-string-literal`
command line argument. [[Feature #20205]]
* `it` is added to reference a block parameter. [[Feature #18980]]
* Keyword splatting `nil` when calling methods is now supported.
`**nil` is treated similarly to `**{}`, passing no keywords,
and not calling any conversion methods. [[Bug #20064]]
* Block passing is no longer allowed in index assignment
(e.g. `a[0, &b] = 1`). [[Bug #19918]]
* Keyword arguments are no longer allowed in index assignment
(e.g. `a[0, kw: 1] = 2`). [[Bug #20218]]
* GC.config added to allow setting configuration variables on the Garbage
Collector. [[Feature #20443]]
* GC configuration parameter `rgengc_allow_full_mark` introduced. When `false`
GC will only mark young objects. Default is `true`. [[Feature #20443]]
## Core classes updates
Note: We're only listing outstanding class updates.
* Exception
* Exception#set_backtrace now accepts arrays of Thread::Backtrace::Location.
Kernel#raise, Thread#raise and Fiber#raise also accept this new format. [[Feature #13557]]
* Range
* Range#size now raises TypeError if the range is not iterable. [[Misc #18984]]
* Range#step now consistently has a semantics of iterating by using `+` operator
for all types, not only numerics. [[Feature #18368]]
```ruby
(Time.utc(2022, 2, 24)..).step(24*60*60).take(3)
#=> [2022-02-24 00:00:00 UTC, 2022-02-25 00:00:00 UTC, 2022-02-26 00:00:00 UTC]
```
* RubyVM::AbstractSyntaxTree
* Add RubyVM::AbstractSyntaxTree::Node#locations method which returns location objects
associated with the AST node. [[Feature #20624]]
* Add RubyVM::AbstractSyntaxTree::Location class which holds location information. [[Feature #20624]]
## Stdlib updates
The following default gem is added.
* win32-registry 0.0.1
* Tempfile
* The keyword argument `anonymous: true` is implemented for Tempfile.create.
`Tempfile.create(anonymous: true)` removes the created temporary file immediately.
So applications don't need to remove the file.
[[Feature #20497]]
* win32/sspi.rb
* This library is now extracted from the Ruby repository to [ruby/net-http-sspi].
[[Feature #20775]]
The following default gems are updated.
* RubyGems 3.6.0.dev
* bundler 2.6.0.dev
* erb 4.0.4
* fiddle 1.1.4.dev
* io-console 0.7.2
* irb 1.14.1
* json 2.7.2
* logger 1.6.1
* net-http 0.4.1
* optparse 0.5.0
* prism 1.0.0
* psych 5.2.0.beta1
* rdoc 6.7.0
* reline 0.5.10
* resolv 0.4.0
* stringio 3.1.2.dev
* strscan 3.1.1.dev
* time 0.4.0
* uri 0.13.1
* zlib 3.1.1
The following bundled gems are updated.
* minitest 5.25.1
* power_assert 2.0.4
* rake 13.2.1
* test-unit 3.6.2
* rexml 3.3.8
* rss 0.3.1
* net-ftp 0.3.8
* net-imap 0.4.17
* net-smtp 0.5.0
* rbs 3.6.1
* typeprof 0.21.11
* debug 1.9.2
* racc 1.8.1
The following bundled gems are promoted from default gems.
* mutex_m 0.2.0
* getoptlong 0.2.1
* base64 0.2.0
* bigdecimal 3.1.8
* observer 0.1.2
* abbrev 0.1.2
* resolv-replace 0.1.1
* rinda 0.2.0
* drb 2.2.1
* nkf 0.2.0
* syslog 0.1.2
* csv 3.3.0
The following bundled gem is added.
* repl_type_completor 0.1.7
See GitHub releases like [GitHub Releases of Logger] or changelog for
details of the default gems or bundled gems.
[ruby/net-http-sspi]: https://github.com/ruby/net-http-sspi
[GitHub Releases of Logger]: https://github.com/ruby/logger/releases
## Supported platforms
## Compatibility issues
* Error messages and backtrace displays have been changed.
* Use a single quote instead of a backtick as an opening quote. [[Feature #16495]]
* Display a class name before a method name (only when the class has a permanent name). [[Feature #19117]]
* Kernel#caller, Thread::Backtrace::Location’s methods, etc. are also changed accordingly.
Old:
```
test.rb:1:in `foo': undefined method `time' for an instance of Integer
from test.rb:2:in `<main>'
```
New:
```
test.rb:1:in 'Object#foo': undefined method 'time' for an instance of Integer
from test.rb:2:in '<main>'
```
* Hash#inspect rendering have been changed. [[Bug #20433]]
* Symbol keys are displayed using the modern symbol key syntax: `"{user: 1}"`
* Other keys now have spaces around `=>`: `'{"user" => 1}'`, while previously they didn't: `'{"user"=>1}'`
## Stdlib compatibility issues
## C API updates
* `rb_newobj` and `rb_newobj_of` (and corresponding macros `RB_NEWOBJ`, `RB_NEWOBJ_OF`, `NEWOBJ`, `NEWOBJ_OF`) have been removed. [[Feature #20265]]
* Removed deprecated function `rb_gc_force_recycle`. [[Feature #18290]]
## Implementation improvements
* Array#each is rewritten in Ruby for better performance [[Feature #20182]].
## JIT
## Miscellaneous changes
* Passing a block to a method which doesn't use the passed block will show
a warning on verbose mode (`-w`).
[[Feature #15554]]
* Redefining some core methods that are specially optimized by the interpreter
and JIT like String#freeze or Integer#+ now emits a performance class
warning (`-W:performance` or `Warning[:performance] = true`).
[[Feature #20429]]
[Feature #13557]: https://bugs.ruby-lang.org/issues/13557
[Feature #15554]: https://bugs.ruby-lang.org/issues/15554
[Feature #16495]: https://bugs.ruby-lang.org/issues/16495
[Feature #18290]: https://bugs.ruby-lang.org/issues/18290
[Feature #18368]: https://bugs.ruby-lang.org/issues/18368
[Feature #18980]: https://bugs.ruby-lang.org/issues/18980
[Misc #18984]: https://bugs.ruby-lang.org/issues/18984
[Feature #19117]: https://bugs.ruby-lang.org/issues/19117
[Bug #19918]: https://bugs.ruby-lang.org/issues/19918
[Bug #20064]: https://bugs.ruby-lang.org/issues/20064
[Feature #20182]: https://bugs.ruby-lang.org/issues/20182
[Feature #20205]: https://bugs.ruby-lang.org/issues/20205
[Bug #20218]: https://bugs.ruby-lang.org/issues/20218
[Feature #20265]: https://bugs.ruby-lang.org/issues/20265
[Feature #20429]: https://bugs.ruby-lang.org/issues/20429
[Bug #20433]: https://bugs.ruby-lang.org/issues/20433
[Feature #20443]: https://bugs.ruby-lang.org/issues/20443
[Feature #20497]: https://bugs.ruby-lang.org/issues/20497
[Feature #20624]: https://bugs.ruby-lang.org/issues/20624
[Feature #20775]: https://bugs.ruby-lang.org/issues/20775
|
