170 lines
5.1 KiB
Markdown
170 lines
5.1 KiB
Markdown
# NEWS for Ruby 2.8.0 (tentative; to be 3.0.0)
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This document is a list of user visible feature changes
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since the **2.7.0** release, except for bug fixes.
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Note that each entry is kept so brief that no reason behind or reference
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information is supplied with. For a full list of changes with all
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sufficient information, see the ChangeLog file or Redmine
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(e.g. `https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER`).
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## Language changes
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* Keyword arguments are now separated from positional arguments.
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Code that resulted in deprecation warnings in Ruby 2.7 will now
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result in ArgumentError or different behavior. [[Feature #14183]]
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* Procs accepting a single rest argument and keywords are no longer
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subject to autosplatting. This now matches the behavior of Procs
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accepting a single rest argument and no keywords.
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[[Feature #16166]]
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```ruby
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pr = proc{|*a, **kw| [a, kw]}
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pr.call([1])
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# 2.7 => [[1], {}]
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# 3.0 => [[[1]], {}]
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pr.call([1, {a: 1}])
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# 2.7 => [[1], {:a=>1}] # and deprecation warning
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# 3.0 => [[[1, {:a=>1}]], {}]
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```
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* $SAFE is now a normal global variable with no special behavior.
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[[Feature #16131]]
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* yield in singleton class definitions in methods is now a SyntaxError
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instead of a warning. yield in a class definition outside of a method
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is now a SyntaxError instead of a LocalJumpError. [[Feature #15575]]
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## Command line options
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## Core classes updates
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Outstanding ones only.
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* Dir
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* Modified method
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* Dir.glob and Dir.[] now sort the results by default, and
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accept `sort:` keyword option. [[Feature #8709]]
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* Hash
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* Modified method
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* Hash#transform_keys now accepts a hash that maps keys to new
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keys. [[Feature #16274]]
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* Kernel
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* Modified method
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* Kernel#clone when called with `freeze: false` keyword will call
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#initialize_clone with the `freeze: false` keyword.
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[[Bug #14266]]
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* Kernel#eval when called with two arguments will use "(eval)"
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for `__FILE__` and 1 for `__LINE__` in the evaluated code.
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[[Bug #4352]]
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* Module
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* Modified method
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* Module#include now includes the arguments in modules and
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classes that have already included or prepended the receiver,
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mirroring the behavior if the arguments were included in the
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receiver before the other modules and classes included or
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prepended the receiver. [[Feature #9573]]
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* Symbol
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* Modified method
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* Symbol#to_proc now returns a lambda Proc.
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[[Feature #16260]]
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## Stdlib updates
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Outstanding ones only.
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* Net::HTTP
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* New method
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* Add Net::HTTP#verify_hostname= and Net::HTTP#verify_hostname
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to skip hostname verification. [[Feature #16555]]
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* Modified method
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* Net::HTTP.get, Net::HTTP.get_response, and Net::HTTP.get_print can
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take request headers as a Hash in the second argument when the first
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argument is a URI.
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## Compatibility issues
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Excluding feature bug fixes.
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* Regexp literals are frozen [[Feature #8948]] [[Feature #16377]]
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```ruby
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/foo/.frozen? #=> true
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```
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* Bundled gems
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* net-telnet and xmlrpc have been removed from the bundled gems.
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If you are interested in maintaining them, please comment on
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your plan to https://github.com/ruby/xmlrpc
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or https://github.com/ruby/net-telnet.
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* EXPERIMENTAL: Hash#each consistently yields a 2-element array [[Bug #12706]]
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* Now `{ a: 1 }.each(&->(k, v) { })` raises an ArgumentError
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due to lambda's arity check.
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* This is experimental; if it brings a big incompatibility issue,
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it may be reverted until 2.8/3.0 release.
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## Stdlib compatibility issues
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Excluding feature bug fixes.
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## C API updates
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* C API functions related to $SAFE have been removed.
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[[Feature #16131]]
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## Implementation improvements
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* The number of hashes allocated when using a keyword splat in
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a method call has been reduced to a maximum of 1, and passing
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a keyword splat to a method that accepts specific keywords
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does not allocate a hash.
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## Miscellaneous changes
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* Methods using `ruby2_keywords` will no longer keep empty keyword
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splats, those are now removed just as they are for methods not
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using `ruby2_keywords`.
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* Taint deprecation warnings are now issued in regular mode in
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addition to verbose warning mode. [[Feature #16131]]
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[Bug #4352]: https://bugs.ruby-lang.org/issues/4352
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[Feature #8709]: https://bugs.ruby-lang.org/issues/8709
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[Feature #8948]: https://bugs.ruby-lang.org/issues/8948
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[Feature #9573]: https://bugs.ruby-lang.org/issues/9573
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[Feature #14183]: https://bugs.ruby-lang.org/issues/14183
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[Bug #14266]: https://bugs.ruby-lang.org/issues/14266
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[Feature #15575]: https://bugs.ruby-lang.org/issues/15575
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[Feature #16131]: https://bugs.ruby-lang.org/issues/16131
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[Feature #16166]: https://bugs.ruby-lang.org/issues/16166
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[Feature #16260]: https://bugs.ruby-lang.org/issues/16260
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[Feature #16274]: https://bugs.ruby-lang.org/issues/16274
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[Feature #16377]: https://bugs.ruby-lang.org/issues/16377
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[Feature #16555]: https://bugs.ruby-lang.org/issues/16555
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