ruby/NEWS.md

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]

  def foo(*)
    bar(*)
  end
  def baz(**)
    quux(**)
  end
  

• Constant assignment evaluation order for constants set on explicit objects has been made consistent with single attribute assignment evaluation order. With this code:

  foo::BAR = baz
  

  foo is now called before baz. Similarly, for multiple assignment to constants, left-to-right evaluation order is used. With this code:

    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]

Command line options

Core classes updates

Note: We're only listing outstanding class updates.

• 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]

• 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]

• Proc

  • Proc#dup returns an instance of subclass. [Bug #17545]

• Refinement

  • Refinement#refined_class has been added. [Feature #12737]

• Set

  • Set is now available as a builtin 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]

• Struct

  • A Struct class can also be initialized with keyword arguments without keyword_init: true on Struct.new [Feature #16806]

Stdlib updates

• The following default gem are updated.
  • RubyGems 3.4.0.dev
  • bigdecimal 3.1.2
  • bundler 2.4.0.dev
  • etc 1.4.0
  • io-console 0.5.11
  • io-wait 0.2.2
  • ipaddr 1.2.4
  • reline 0.3.1
  • securerandom 0.2.0
• The following bundled gems are updated.
  • net-imap 0.2.3
  • rbs 2.2.2
  • typeprof 0.21.2
• 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

C API updates

Removed C APIs

The following deprecated APIs are removed.

• rb_cData variable.
• "taintedness" and "trustedness" functions. [Feature #16131]

Implementation improvements

JIT

MJIT

YJIT: New experimental in-process JIT compiler

Static analysis

RBS

TypeProf

Debugger

error_highlight

IRB Autocomplete and Document Display

Miscellaneous changes