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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]

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

  • A proc that accepts a single positional argument and keywords will no longer autosplat. [Bug #18633]

    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:

    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:

      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]

    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.

  • 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

  • Module

  • Proc

  • 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

  • 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 5.16.1
    • net-imap 0.2.3
    • rbs 2.5.1
    • typeprof 0.21.2
    • debug 1.5.0
  • The following default gems are now bundled gems.

Compatibility issues

Note: Excluding feature bug fixes.

Removed constants

The following deprecated constants are removed.

Removed methods

The following deprecated methods are removed.

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