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NEWS for Ruby 3.5.0

This document is a list of user-visible feature changes since the 3.4.0 release, except for bug fixes.

Note that each entry is kept to a minimum, see links for details.

Language changes

  • *nil no longer calls nil.to_a, similar to how **nil does not call nil.to_hash. [Feature #21047]

Core classes updates

Note: We're only listing outstanding class updates.

  • Binding

    • Binding#local_variables does no longer include numbered parameters. Also, Binding#local_variable_get and Binding#local_variable_set reject to handle numbered parameters. [Bug #21049]

  • IO

    • IO.select accepts +Float::INFINITY+ as a timeout argument. [Feature #20610]

  • Set

    • Set is now a core class, instead of an autoloaded stdlib class. [Feature #21216]

  • String

Stdlib updates

The following bundled gems are promoted from default gems.

  • ostruct 0.6.1
  • pstore 0.2.0
  • benchmark 0.4.0
  • logger 1.7.0
  • rdoc 6.14.0
  • win32ole 1.9.2
  • irb 1.15.2
  • reline 0.6.1
  • readline 0.0.4
  • fiddle 1.1.8

We only list stdlib changes that are notable feature changes.

Other changes are listed in the following sections. We also listed release history from the previous bundled version that is Ruby 3.3.0 if it has GitHub releases.

The following default gem is added.

  • win32-registry 0.1.0

The following default gems are updated.

  • RubyGems 3.7.0.dev
  • bundler 2.7.0.dev
  • erb 5.0.1
  • json 2.12.0
  • optparse 0.7.0.dev.2
  • prism 1.4.0
  • psych 5.2.6
  • stringio 3.1.8.dev
  • strscan 3.1.5.dev
  • uri 1.0.3

The following bundled gems are added.

The following bundled gems are updated.

  • minitest 5.25.5
  • test-unit 3.6.8
  • rexml 3.4.1
  • net-imap 0.5.8
  • net-smtp 0.5.1
  • rbs 3.9.4
  • bigdecimal 3.1.9
  • drb 2.2.3
  • syslog 0.3.0
  • csv 3.3.4
  • repl_type_completor 0.1.11

Supported platforms

Compatibility issues

Stdlib compatibility issues

  • CGI library is removed from the default gems. Now we only provide cgi/escape for the following methods:

    • CGI.escape and CGI.unescape
    • CGI.escapeHTML and CGI.unescapeHTML
    • CGI.escapeURIComponent and CGI.unescapeURIComponent
    • CGI.escapeElement and CGI.unescapeElement

    [Feature #21258]

  • With the move of Set from stdlib to core class, set/sorted_set.rb has been removed, and SortedSet is no longer an autoloaded constant. Please install the sorted_set gem and require 'sorted_set' to use SortedSet. [Feature #21287]

C API updates

  • IO

    • rb_thread_fd_close is deprecated and now a no-op. If you need to expose file descriptors from C extensions to Ruby code, create an IO instance using RUBY_IO_MODE_EXTERNAL and use rb_io_close(io) to close it (this also interrupts and waits for all pending operations on the IO instance). Directly closing file descriptors does not interrupt pending operations, and may lead to undefined behaviour. In other words, if two IO objects share the same file descriptor, closing one does not affect the other. [Feature #18455]

Implementation improvements

JIT