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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 behave
as if they were frozen. If they are mutated a deprecation warning is emitted.
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. [[Bug #19918]]
* Keyword arguments are no longer allowed in index. [[Bug #20218]]
## 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]]
## Stdlib updates
The following default gems are updated.
* RubyGems 3.6.0.dev
* bundler 2.6.0.dev
* erb 4.0.4
* fiddle 1.1.3
* io-console 0.7.2
* irb 1.12.0
* json 2.7.2
* net-http 0.4.1
* optparse 0.5.0
* prism 0.26.0
* rdoc 6.6.3.1
* reline 0.5.2
* resolv 0.4.0
* stringio 3.1.1
* strscan 3.1.1
The following bundled gems are updated.
* minitest 5.22.3
* rake 13.2.1
* test-unit 3.6.2
* net-ftp 0.3.4
* net-imap 0.4.10
* net-smtp 0.5.0
* rbs 3.4.4
* typeprof 0.21.11
* debug 1.9.2
The following bundled gems are promoted from default gems.
* mutex_m 0.2.0
* getoptlong 0.2.1
* base64 0.2.0
* bigdecimal 3.1.7
* 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
See GitHub releases like [GitHub Releases of Logger](https://github.com/ruby/logger/releases) or changelog for details of the default gems or bundled gems.
## Supported platforms
## Compatibility issues
* Error messages and backtrace displays have been changed.
* Use a single quote instead of a backtick as a 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>'
```
## 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 interpeter
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 #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
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