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ruby--ruby/NEWS.md
Kazuhiro NISHIYAMA 1520936aa7
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2022-08-01 12:34:03 +09:00

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# NEWS for Ruby 3.2.0
This document is a list of user-visible feature changes
since the **3.1.0** release, except for bug fixes.
Note that each entry is kept to a minimum, see links for details.
## Language changes
* Anonymous rest and keyword rest arguments can now be passed as
arguments, instead of just used in method parameters.
[[Feature #18351]]
```ruby
def foo(*)
bar(*)
end
def baz(**)
quux(**)
end
```
* A proc that accepts a single positional argument and keywords will
no longer autosplat. [[Bug #18633]]
```ruby
proc{|a, **k| a}.call([1, 2])
# Ruby 3.1 and before
# => 1
# Ruby 3.2 and after
# => [1, 2]
```
* Constant assignment evaluation order for constants set on explicit
objects has been made consistent with single attribute assignment
evaluation order. With this code:
```ruby
foo::BAR = baz
```
`foo` is now called before `baz`. Similarly, for multiple assignments
to constants, left-to-right evaluation order is used. With this
code:
```ruby
foo1::BAR1, foo2::BAR2 = baz1, baz2
```
The following evaluation order is now used:
1. `foo1`
2. `foo2`
3. `baz1`
4. `baz2`
[[Bug #15928]]
* Find pattern is no longer experimental.
[[Feature #18585]]
* Methods taking a rest parameter (like `*args`) and wishing to delegate keyword
arguments through `foo(*args)` must now be marked with `ruby2_keywords`
(if not already the case). In other words, all methods wishing to delegate
keyword arguments through `*args` must now be marked with `ruby2_keywords`,
with no exception. This will make it easier to transition to other ways of
delegation once a library can require Ruby 3+. Previously, the `ruby2_keywords`
flag was kept if the receiving method took `*args`, but this was a bug and an
inconsistency. A good technique to find the potentially-missing `ruby2_keywords`
is to run the test suite, for where it fails find the last method which must
receive keyword arguments, use `puts nil, caller, nil` there, and check each
method/block on the call chain which must delegate keywords is correctly marked
as `ruby2_keywords`. [[Bug #18625]] [[Bug #16466]]
```ruby
def target(**kw)
end
# Accidentally worked without ruby2_keywords in Ruby 2.7-3.1, ruby2_keywords
# needed in 3.2+. Just like (*args, **kwargs) or (...) would be needed on
# both #foo and #bar when migrating away from ruby2_keywords.
ruby2_keywords def bar(*args)
target(*args)
end
ruby2_keywords def foo(*args)
bar(*args)
end
foo(k: 1)
```
## Command line options
## Core classes updates
Note: We're only listing outstanding class updates.
* Enumerator
* Enumerator.product has been added. Enumerator::Product is the implementation. [[Feature #18685]]
* Hash
* Hash#shift now always returns nil if the hash is
empty, instead of returning the default value or
calling the default proc. [[Bug #16908]]
* Kernel
* Kernel#binding raises RuntimeError if called from a non-Ruby frame
(such as a method defined in C). [[Bug #18487]]
* MatchData
* MatchData#byteoffset has been added. [[Feature #13110]]
* Module
* Module.used_refinements has been added. [[Feature #14332]]
* Module#refinements has been added. [[Feature #12737]]
* Module#const_added has been added. [[Feature #17881]]
* Module#undefined_instance_methods has been added. [[Feature #12655]]
* Proc
* Proc#dup returns an instance of subclass. [[Bug #17545]]
* Proc#parameters now accepts lambda keyword. [[Feature #15357]]
* Regexp
* Regexp.new now supports passing the regexp flags not only as an Integer,
but also as a String Unknown flags raise errors. Otherwise, anything
other than `true`, `false`, `nil` or Integer will be warned.
[[Feature #18788]]
* Refinement
* Refinement#refined_class has been added. [[Feature #12737]]
* Set
* Set is now available as a built-in class without the need for `require "set"`. [[Feature #16989]]
It is currently autoloaded via the `Set` constant or a call to `Enumerable#to_set`.
* String
* String#byteindex and String#byterindex have been added. [[Feature #13110]]
* Update Unicode to Version 14.0.0 and Emoji Version 14.0. [[Feature #18037]]
(also applies to Regexp)
* String#bytesplice has been added. [[Feature #18598]]
* Struct
* A Struct class can also be initialized with keyword arguments
without `keyword_init: true` on `Struct.new` [[Feature #16806]]
* TracePoint
* TracePoint#binding now returns `nil` for `c_call`/`c_return` TracePoints.
[[Bug #18487]]
* TracePoint#enable `target_thread` keyword argument now defaults to the
current thread if `target` and `target_line` keyword arguments are not
passed. [[Bug #16889]]
## Stdlib updates
* The following default gems are updated.
* RubyGems 3.4.0.dev
* bigdecimal 3.1.2
* bundler 2.4.0.dev
* cgi 0.3.2
* etc 1.4.0
* io-console 0.5.11
* io-nonblock 0.1.1
* io-wait 0.3.0.pre
* ipaddr 1.2.4
* json 2.6.2
* logger 1.5.1
* net-http 0.2.2
* net-protocol 0.1.3
* ostruct 0.5.5
* psych 5.0.0.dev
* reline 0.3.1
* securerandom 0.2.0
* stringio 3.0.3
* timeout 0.3.0
* The following bundled gems are updated.
* minitest 5.16.2
* net-imap 0.2.3
* rbs 2.6.0
* typeprof 0.21.3
* debug 1.6.1
* The following default gems are now bundled gems.
## Compatibility issues
Note: Excluding feature bug fixes.
### Removed constants
The following deprecated constants are removed.
* `Fixnum` and `Bignum` [[Feature #12005]]
* `Random::DEFAULT` [[Feature #17351]]
* `Struct::Group`
* `Struct::Passwd`
### Removed methods
The following deprecated methods are removed.
* `Dir.exists?` [[Feature #17391]]
* `File.exists?` [[Feature #17391]]
* `Kernel#=~` [[Feature #15231]]
* `Kernel#taint`, `Kernel#untaint`, `Kernel#tainted?`
[[Feature #16131]]
* `Kernel#trust`, `Kernel#untrust`, `Kernel#untrusted?`
[[Feature #16131]]
## Stdlib compatibility issues
* `Psych` no longer bundles libyaml sources.
Users need to install the libyaml library themselves via the package
system. [[Feature #18571]]
## C API updates
### Removed C APIs
The following deprecated APIs are removed.
* `rb_cData` variable.
* "taintedness" and "trustedness" functions. [[Feature #16131]]
## Implementation improvements
* Fixed several race conditions in `Kernel#autoload`. [[Bug #18782]]
## JIT
### MJIT
### YJIT: New experimental in-process JIT compiler
## Static analysis
### RBS
### TypeProf
## Debugger
## error_highlight
## IRB Autocomplete and Document Display
## Miscellaneous changes
[Feature #12005]: https://bugs.ruby-lang.org/issues/12005
[Feature #12655]: https://bugs.ruby-lang.org/issues/12655
[Feature #12737]: https://bugs.ruby-lang.org/issues/12737
[Feature #13110]: https://bugs.ruby-lang.org/issues/13110
[Feature #14332]: https://bugs.ruby-lang.org/issues/14332
[Feature #15231]: https://bugs.ruby-lang.org/issues/15231
[Feature #15357]: https://bugs.ruby-lang.org/issues/15357
[Bug #15928]: https://bugs.ruby-lang.org/issues/15928
[Feature #16131]: https://bugs.ruby-lang.org/issues/16131
[Bug #16466]: https://bugs.ruby-lang.org/issues/16466
[Feature #16806]: https://bugs.ruby-lang.org/issues/16806
[Bug #16889]: https://bugs.ruby-lang.org/issues/16889
[Bug #16908]: https://bugs.ruby-lang.org/issues/16908
[Feature #16989]: https://bugs.ruby-lang.org/issues/16989
[Feature #17351]: https://bugs.ruby-lang.org/issues/17351
[Feature #17391]: https://bugs.ruby-lang.org/issues/17391
[Bug #17545]: https://bugs.ruby-lang.org/issues/17545
[Feature #17881]: https://bugs.ruby-lang.org/issues/17881
[Feature #18037]: https://bugs.ruby-lang.org/issues/18037
[Feature #18351]: https://bugs.ruby-lang.org/issues/18351
[Bug #18487]: https://bugs.ruby-lang.org/issues/18487
[Feature #18571]: https://bugs.ruby-lang.org/issues/18571
[Feature #18585]: https://bugs.ruby-lang.org/issues/18585
[Feature #18598]: https://bugs.ruby-lang.org/issues/18598
[Bug #18625]: https://bugs.ruby-lang.org/issues/18625
[Bug #18633]: https://bugs.ruby-lang.org/issues/18633
[Feature #18685]: https://bugs.ruby-lang.org/issues/18685
[Bug #18782]: https://bugs.ruby-lang.org/issues/18782
[Feature #18788]: https://bugs.ruby-lang.org/issues/18788
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