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@@ -1,120 +1,16 @@ -# NEWS for Ruby 3.1.0 +# NEWS for Ruby 4.1.0 This document is a list of user-visible feature changes -since the **3.0.0** release, except for bug fixes. +since the **4.0.0** release, except for bug fixes. Note that each entry is kept to a minimum, see links for details. ## Language changes -* The block argument can now be anonymous if the block will - only be passed to another method. [[Feature #11256]] - - ```ruby - def foo(&) - bar(&) - end - ``` - -* Pin operator now takes an expression. [[Feature #17411]] - - ```ruby - Prime.each_cons(2).lazy.find_all{_1 in [n, ^(n + 2)]}.take(3).to_a - #=> [[3, 5], [5, 7], [11, 13]] - ``` - -* Pin operator now supports instance, class, and global variables. - [[Feature #17724]] - - ```ruby - @n = 5 - Prime.each_cons(2).lazy.find{_1 in [n, ^@n]} - #=> [3, 5] - ``` - -* One-line pattern matching is no longer experimental. - -* Parentheses can be omitted in one-line pattern matching. - [[Feature #16182]] - - ```ruby - [0, 1] => _, x - {y: 2} => y: - x #=> 1 - y #=> 2 - ``` - -* Multiple assignment evaluation order has been made consistent with - single assignment evaluation order. With single assignment, Ruby - uses a left-to-right evaluation order. With this code: - - ```ruby - foo[0] = bar - ``` - - The following evaluation order is used: - - 1. `foo` - 2. `bar` - 3. `[]=` called on the result of `foo` - - In Ruby before 3.1.0, multiple assignment did not follow this - evaluation order. With this code: - - ```ruby - foo[0], bar.baz = a, b - ``` - - Versions of Ruby before 3.1.0 would evaluate in the following - order - - 1. `a` - 2. `b` - 3. `foo` - 4. `[]=` called on the result of `foo` - 5. `bar` - 6. `baz=` called on the result of `bar` - - Starting in Ruby 3.1.0, the evaluation order is now consistent with - single assignment, with the left-hand side being evaluated before - the right-hand side: - - 1. `foo` - 2. `bar` - 3. `a` - 4. `b` - 5. `[]=` called on the result of `foo` - 6. `baz=` called on the result of `bar` - - [[Bug #4443]] - -* Values in Hash literals and keyword arguments can be omitted. - [[Feature #14579]] - - For example, - - * `{x:, y:}` is a syntax sugar of `{x: x, y: y}`. - * `foo(x:, y:)` is a syntax sugar of `foo(x: x, y: y)`. - - Constant names, local variable names, and method names are allowed as - key names. Note that a reserved word is considered as a local - variable or method name even if it's a pseudo variable name such as - `self`. - -* Non main-Ractors can get instance variables (ivars) of classes/modules - if ivars refer to shareable objects. - [[Feature #17592]] - -* A command syntax is allowed in endless method definitions, i.e., - you can now write `def foo = puts "Hello"`. - Note that `private def foo = puts "Hello"` does not parse. - [[Feature #17398]] - -## Command line options - -* `--disable-gems` is now explicitly declared as "just for debugging". - Never use it in any real-world codebase. - [[Feature #17684]] +* `Module#clone` and `Module#dup` no longer rewrite the lexical scope of + copied methods. Constants and class variables resolve through the + original class, consistent with inheritance and mixins. + [[Feature #21981]] ## Core classes updates @@ -122,536 +18,248 @@ Note: We're only listing outstanding class updates. * Array - * Array#intersect? is added. [[Feature #15198]] - -* Class - - * Class#subclasses, which returns an array of classes - directly inheriting from the receiver, not - including singleton classes. - [[Feature #18273]] - - ```ruby - class A; end - class B < A; end - class C < B; end - class D < A; end - A.subclasses #=> [D, B] - B.subclasses #=> [C] - C.subclasses #=> [] - ``` - -* Enumerable - - * Enumerable#compact is added. [[Feature #17312]] + * `Array#pack` accepts a new format `R` and `r` for unpacking unsigned + and signed LEB128 encoded integers. [[Feature #21785]] + * `Array#pack` accepts a new format `^` that returns the current offset. + Useful when combined with variable width formats like LEB128. [[Feature #21796]] - * Enumerable#tally now accepts an optional hash to count. [[Feature #17744]] +* ENV - * Enumerable#each_cons and each_slice to return a receiver. [[GH-1509]] - - ```ruby - [1, 2, 3].each_cons(2){} - # 3.0 => nil - # 3.1 => [1, 2, 3] - - [1, 2, 3].each_slice(2){} - # 3.0 => nil - # 3.1 => [1, 2, 3] - ``` - -* Enumerator::Lazy - - * Enumerator::Lazy#compact is added. [[Feature #17312]] - -* File - - * File.dirname now accepts an optional argument for the level to - strip path components. [[Feature #12194]] - -* GC - - * "GC.measure_total_time = true" enables the measurement of GC. - Measurement can introduce overhead. It is enabled by default. - GC.measure_total_time returns the current setting. - GC.stat[:time] or GC.stat(:time) returns measured time - in milli-seconds. [[[Feature #10917]]] - - * GC.total_time returns measured time in nano-seconds. [[[Feature #10917]]] - -* Integer - - * Integer.try_convert is added. [[Feature #15211]] + * `ENV.fetch_values` is added. It returns an array of values for the + given names, raising `KeyError` for missing names unless a block is + given. [[Feature #21781]] * Kernel - - * Kernel#load now accepts a module as the second argument, - and will load the file using the given module as the - top-level module. [[Feature #6210]] - -* Marshal - - * Marshal.load now accepts a `freeze: true` option. - All returned objects are frozen except for `Class` and - `Module` instances. Strings are deduplicated. [[Feature #18148]] + * `Kernel#autoload_relative` and `Module#autoload_relative` are added. + These methods work like `autoload`, but resolve the file path relative + to the file where the method is called, similar to `require_relative`. + This makes it easier to autoload constants from files in the same + directory without hardcoding absolute paths or manipulating `$LOAD_PATH`. + [[Feature #15330]] * MatchData - * MatchData#match is added [[Feature #18172]] - - * MatchData#match_length is added [[Feature #18172]] - -* Method / UnboundMethod - - * Method#public?, Method#private?, Method#protected?, - UnboundMethod#public?, UnboundMethod#private?, - UnboundMethod#protected? have been added. [[Feature #11689]] - -* Module - - * Module#prepend now modifies the ancestor chain if the receiver - already includes the argument. Module#prepend still does not - modify the ancestor chain if the receiver has already prepended - the argument. [[Bug #17423]] - - * Module#private, #public, #protected, and #module_function will - now return their arguments. If a single argument is given, it - is returned. If no arguments are given, nil is returned. If - multiple arguments are given, they are returned as an array. - [[Feature #12495]] - -* Process - - * Process.\_fork is added. This is a core method for fork(2). - Do not call this method directly; it is called by existing - fork methods: Kernel.#fork, Process.fork, and IO.popen("-"). - Application monitoring libraries can overwrite this method to - hook fork events. [[Feature #17795]] - -* Struct - - * Passing only keyword arguments to Struct#initialize is warned. - You need to use a Hash literal to set a Hash to a first member. - [[Feature #16806]] - - * StructClass#keyword_init? is added [[Feature #18008]] - -* String - - * Update Unicode version to 13.0.0 [[Feature #17750]] - and Emoji version to 13.0 [[Feature #18029]] - - * String#unpack and String#unpack1 now accept an `offset:` keyword - argument to start the unpacking after an arbitrary number of bytes - have been skipped. If `offset` is outside of the string bounds - `ArgumentError` is raised. [[Feature #18254]] - -* Thread - - * Thread#native_thread_id is added. [[Feature #17853]] - -* Thread::Backtrace + * `MatchData#integer_at` is added. It converts the matched substring to + integer and return the result. [[Feature #21932]] - * Thread::Backtrace.limit, which returns the value to limit backtrace - length set by `--backtrace-limit` command line option, is added. - [[Feature #17479]] +* Regexp -* Thread::Queue + * All instances of `Regexp` are now frozen, not just literals. + Subclasses of `Regexp` are not frozen for compatibility. + [[Feature #8948]] - * Thread::Queue.new now accepts an Enumerable of initial values. - [[Feature #17327]] +* Set -* Time - - * Time.new now accepts optional `in:` keyword argument for the - timezone, as well as `Time.at` and `Time.now`, so that is now - you can omit minor arguments to `Time.new`. [[Feature #17485]] - - ```ruby - Time.new(2021, 12, 25, in: "+07:00") - #=> 2021-12-25 00:00:00 +0700 - ``` - - At the same time, time component strings are converted to - integers more strictly now. - - ```ruby - Time.new(2021, 12, 25, "+07:30") - #=> invalid value for Integer(): "+07:30" (ArgumentError) - ``` - - Ruby 3.0 or earlier returned probably unexpected result - `2021-12-25 07:00:00`, not `2021-12-25 07:30:00` nor - `2021-12-25 00:00:00 +07:30`. - - * Time#strftime supports RFC 3339 UTC for unknown offset local - time, `-0000`, as `%-z`. [[Feature #17544]] - -* TracePoint - - * TracePoint.allow_reentry is added to allow reenter while TracePoint - callback. - [[Feature #15912]] - -* $LOAD_PATH - - * $LOAD_PATH.resolve_feature_path does not raise. [[Feature #16043]] - -* Fiber Scheduler - - * Add support for `Addrinfo.getaddrinfo` using `address_resolve` hook. - [[Feature #17370]] - - * Introduce non-blocking `Timeout.timeout` using `timeout_after` hook. - [[Feature #17470]] - - * Introduce new scheduler hooks `io_read` and `io_write` along with a - low level `IO::Buffer` for zero-copy read/write. [[Feature #18020]] - - * IO hooks `io_wait`, `io_read`, `io_write`, receive the original IO object - where possible. [[Bug #18003]] - - * Make `Monitor` fiber-safe. [[Bug #17827]] - - * Replace copy coroutine with pthread implementation. [[Feature #18015]] - -* Refinement - - * New class which represents a module created by Module#refine. - `include` and `prepend` are deprecated, and `import_methods` is added - instead. [[Bug #17429]] + * A deprecated behavior, `Set#to_set`, `Range#to_set`, and + `Enumerable#to_set` accepting arguments, was removed. [[Feature #21390]] ## Stdlib updates -* The following default gem are updated. - * RubyGems 3.3.3 - * base64 0.1.1 - * benchmark 0.2.0 - * bigdecimal 3.1.1 - * bundler 2.3.3 - * cgi 0.3.1 - * csv 3.2.2 - * date 3.2.2 - * did_you_mean 1.6.1 - * digest 3.1.0 - * drb 2.1.0 - * erb 2.2.3 - * error_highlight 0.3.0 - * etc 1.3.0 - * fcntl 1.0.1 - * fiddle 1.1.0 - * fileutils 1.6.0 - * find 0.1.1 - * io-console 0.5.10 - * io-wait 0.2.1 - * ipaddr 1.2.3 - * irb 1.4.1 - * json 2.6.1 - * logger 1.5.0 - * net-http 0.2.0 - * net-protocol 0.1.2 - * nkf 0.1.1 - * open-uri 0.2.0 - * openssl 3.0.0 - * optparse 0.2.0 - * ostruct 0.5.2 - * pathname 0.2.0 - * pp 0.3.0 - * prettyprint 0.1.1 - * psych 4.0.3 - * racc 1.6.0 - * rdoc 6.4.0 - * readline 0.0.3 - * readline-ext 0.1.4 - * reline 0.3.0 - * resolv 0.2.1 - * rinda 0.1.1 - * ruby2_keywords 0.0.5 - * securerandom 0.1.1 - * set 1.0.2 - * stringio 3.0.1 - * strscan 3.0.1 - * tempfile 0.1.2 - * time 0.2.0 - * timeout 0.2.0 - * tmpdir 0.1.2 - * un 0.2.0 - * uri 0.11.0 - * yaml 0.2.0 - * zlib 2.1.1 -* The following bundled gems are updated. - * minitest 5.15.0 - * power_assert 2.0.1 - * rake 13.0.6 - * test-unit 3.5.3 - * rexml 3.2.5 - * rbs 2.1.0 - * typeprof 0.21.2 -* The following default gems are now bundled gems. - * net-ftp 0.1.3 - * net-imap 0.2.3 - * net-pop 0.1.1 - * net-smtp 0.3.1 - * matrix 0.4.2 - * prime 0.1.2 - * debug 1.4.0 - -* Coverage measurement now supports suspension. You can use `Coverage.suspend` - to stop the measurement temporarily, and `Coverage.resume` to restart it. - See [[Feature #18176]] in detail. - -* Random::Formatter is moved to random/formatter.rb, so that you can - use `Random#hex`, `Random#base64`, and so on without SecureRandom. - [[Feature #18190]] +### The following bundled gems are added. + + +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 3.4.0 if it has GitHub +releases. + +### The following bundled gems are promoted from default gems. + +* tsort 0.2.0 +* win32-registry 0.1.2 + +### The following default gem is added. + +### The following default gems are updated. + +* RubyGems 4.1.0.dev + * 4.0.3 to [v4.0.4][RubyGems-v4.0.4], [v4.0.5][RubyGems-v4.0.5], [v4.0.6][RubyGems-v4.0.6], [v4.0.7][RubyGems-v4.0.7], [v4.0.8][RubyGems-v4.0.8], [v4.0.9][RubyGems-v4.0.9], [v4.0.10][RubyGems-v4.0.10], [v4.0.11][RubyGems-v4.0.11], [v4.0.12][RubyGems-v4.0.12] +* bundler 4.1.0.dev + * 4.0.3 to [v4.0.4][bundler-v4.0.4], [v4.0.5][bundler-v4.0.5], [v4.0.6][bundler-v4.0.6], [v4.0.7][bundler-v4.0.7], [v4.0.8][bundler-v4.0.8], [v4.0.9][bundler-v4.0.9], [v4.0.10][bundler-v4.0.10], [v4.0.11][bundler-v4.0.11], [v4.0.12][bundler-v4.0.12] +* erb 6.0.4 + * 6.0.1 to [v6.0.1.1][erb-v6.0.1.1], [v6.0.2][erb-v6.0.2], [v6.0.3][erb-v6.0.3], [v6.0.4][erb-v6.0.4] +* ipaddr 1.2.9 + * 1.2.8 to [v1.2.9][ipaddr-v1.2.9] +* json 2.19.7 + * 2.18.0 to [v2.18.1][json-v2.18.1], [v2.19.0][json-v2.19.0], [v2.19.1][json-v2.19.1], [v2.19.2][json-v2.19.2], [v2.19.3][json-v2.19.3], [v2.19.4][json-v2.19.4], [v2.19.5][json-v2.19.5], [v2.19.6][json-v2.19.6], [v2.19.7][json-v2.19.7] +* openssl 4.0.2 + * 4.0.0 to [v4.0.1][openssl-v4.0.1], [v4.0.2][openssl-v4.0.2] +* prism 1.9.0 + * 1.7.0 to [v1.8.0][prism-v1.8.0], [v1.8.1][prism-v1.8.1], [v1.9.0][prism-v1.9.0] +* resolv 0.7.1 + * 0.7.0 to [v0.7.1][resolv-v0.7.1] +* stringio 3.2.1.dev +* strscan 3.1.9.dev + * 3.1.6 to [v3.1.7][strscan-v3.1.7], [v3.1.8][strscan-v3.1.8] +* syntax_suggest 3.0.0 +* timeout 0.6.1 + * 0.6.0 to [v0.6.1][timeout-v0.6.1] +* zlib 3.2.3 + * 3.2.2 to [v3.2.3][zlib-v3.2.3] + +### The following bundled gems are updated. + +* minitest 6.0.6 +* rake 13.4.2 + * 13.3.1 to [v13.4.0][rake-v13.4.0], [v13.4.1][rake-v13.4.1], [v13.4.2][rake-v13.4.2] +* test-unit 3.7.7 + * 3.7.5 to [3.7.6][test-unit-3.7.6], [3.7.7][test-unit-3.7.7] +* net-imap 0.6.4 + * 0.6.2 to [v0.6.3][net-imap-v0.6.3], [v0.6.4][net-imap-v0.6.4] +* rbs 4.0.2 + * 3.10.0 to [v3.10.1][rbs-v3.10.1], [v3.10.2][rbs-v3.10.2], [v3.10.3][rbs-v3.10.3], [v3.10.4][rbs-v3.10.4], [v4.0.0.dev.5][rbs-v4.0.0.dev.5], [v4.0.0][rbs-v4.0.0], [v4.0.2][rbs-v4.0.2] +* typeprof 0.32.0 +* mutex_m 0.3.0 +* bigdecimal 4.1.2 + * 4.0.1 to [v4.1.0][bigdecimal-v4.1.0], [v4.1.1][bigdecimal-v4.1.1], [v4.1.2][bigdecimal-v4.1.2] +* resolv-replace 0.2.0 + * 0.1.1 to [v0.2.0][resolv-replace-v0.2.0] +* syslog 0.4.0 + * 0.3.0 to [v0.4.0][syslog-v0.4.0] +* repl_type_completor 0.1.15 + * 0.1.12 to [v0.1.13][repl_type_completor-v0.1.13], [v0.1.14][repl_type_completor-v0.1.14], [v0.1.15][repl_type_completor-v0.1.15] +* pstore 0.2.1 + * 0.2.0 to [v0.2.1][pstore-v0.2.1] +* rdoc 7.2.0 + * 7.0.3 to [v7.0.4][rdoc-v7.0.4], [v7.1.0][rdoc-v7.1.0], [v7.2.0][rdoc-v7.2.0] +* win32ole 1.9.3 + * 1.9.2 to [v1.9.3][win32ole-v1.9.3] +* irb 1.18.0 + * 1.16.0 to [v1.17.0][irb-v1.17.0], [v1.18.0][irb-v1.18.0] + +### RubyGems and Bundler + +Ruby 4.0 bundled RubyGems and Bundler version 4. see the following links for details. + +## Supported platforms ## Compatibility issues -Note: Excluding feature bug fixes. - -* `rb_io_wait_readable`, `rb_io_wait_writable` and `rb_wait_for_single_fd` are - deprecated in favour of `rb_io_maybe_wait_readable`, - `rb_io_maybe_wait_writable` and `rb_io_maybe_wait` respectively. - `rb_thread_wait_fd` and `rb_thread_fd_writable` are deprecated. [[Bug #18003]] - ## Stdlib compatibility issues -* `ERB#initialize` warns `safe_level` and later arguments even without -w. - [[Feature #14256]] - -* `lib/debug.rb` is replaced with `debug.gem` - -* `Kernel#pp` in `lib/pp.rb` uses the width of `IO#winsize` by default. - This means that the output width is automatically changed depending on - your terminal size. [[Feature #12913]] - -* Psych 4.0 changes `Psych.load` as `safe_load` by the default. - You may need to use Psych 3.3.2 for migrating to this behavior. - [[Bug #17866]] - ## C API updates -* Documented. [[GH-4815]] - -* `rb_gc_force_recycle` is deprecated and has been changed to a no-op. - [[Feature #18290]] - -## Implementation improvements - -* Inline cache mechanism is introduced for reading class variables. - [[Feature #17763]] - -* `instance_eval` and `instance_exec` now only allocate a singleton class when - required, avoiding extra objects and improving performance. [[GH-5146]] +### Embedded TypedData -* The performance of `Struct` accessors is improved. [[GH-5131]] +* The `RUBY_TYPED_EMBEDDABLE` flag is now public and documented and can be used by C extensions. + It allows allocating C structs directly into Ruby object slots, which reduces pointer chasing, + and in some case memory usage. + See the C extension documentation for details. [[Feature #21853]] -* `mandatory_only?` builtin special form to improve performance on - builtin methods. [[GH-5112]] +* Added new C23 inspired allocator functions, that takes the previous memory size. + This allow the Ruby GC to better keep track of memory usage, improving its heuristics. + It also improves the performance of system allocators that support C23 `free_sized`. -* Experimental feature Variable Width Allocation in the garbage collector. - This feature is turned off by default and can be enabled by compiling Ruby - with flag `USE_RVARGC=1` set. [[Feature #18045]] [[Feature #18239]] - -## JIT + However, it is important to note that passing an incorrect size to these function is undefined + behavior and may result in crashes or memory leaks. -* Rename Ruby 3.0's `--jit` to `--mjit`, and alias `--jit` to `--yjit` - on non-Windows x86-64 platforms and to `--mjit` on others. + - `ruby_xfree_sized(void *ptr, size_t size)` + - `ruby_xrealloc_sized(void *ptr, size_t newsiz, size_t oldsiz)` + - `ruby_xrealloc2_sized(void *ptr, size_t newelems, size_t newsiz, size_t oldelems)` -### MJIT + [[Feature #21861]] -* The default `--mjit-max-cache` is changed from 100 to 10000. +### Removed APIs -* JIT-ed code is no longer cancelled when a TracePoint for class events - is enabled. +The following APIs, which have been deprecated for many years, are removed. +[[Feature #21768]] -* The JIT compiler no longer skips compilation of methods longer than - 1000 instructions. +* old postponed job functions, +* untyped data object type/functions, +* old APIs to allocate a data object, +* taintedness/trustedness enums/macros, +* `rb_gc_force_recycle` function, +* `rb_iterate` function, +* and some functions and constants for internal use. -* `--mjit-verbose` and `--mjit-warning` output "JIT cancel" when JIT-ed - code is disabled because TracePoint or GC.compact is used. - -### YJIT: New experimental in-process JIT compiler - -New JIT compiler available as an experimental feature. [[Feature #18229]] - -See [this blog post](https://shopify.engineering/yjit-just-in-time-compiler-cruby -) introducing the project. - -* Disabled by default, use `--yjit` command-line option to enable YJIT. - -* Performance improvements on benchmarks based on real-world software, - up to 22% on railsbench, 39% on liquid-render. - -* Fast warm-up times. - -* Limited to Unix-like x86-64 platforms for now. - -## Static analysis - -### RBS - -* Generics type parameters can be bounded ([PR](https://github.com/ruby/rbs/pull/844)). - - ```rbs - # `T` must be compatible with the `_Output` interface. - # `PrettyPrint[String]` is ok, but `PrettyPrint[Integer]` is a type error. - class PrettyPrint[T < _Output] - interface _Output - def <<: (String) -> void - end - - attr_reader output: T - - def initialize: (T output) -> void - end - ``` - -* Type aliases can be generic. ([PR](https://github.com/ruby/rbs/pull/823)) - - ```rbs - # Defines a generic type `list`. - type list[T] = [ T, list[T] ] - | nil - - type str_list = list[String] - type int_list = list[Integer] - ``` - -* [rbs collection](https://github.com/ruby/rbs/blob/master/docs/collection.md) has been introduced to manage gems’ RBSs. - -* Many signatures for built-in and standard libraries have been added/updated. - -* It includes many bug fixes and performance improvements too. - -See the [CHANGELOG.md](https://github.com/ruby/rbs/blob/master/CHANGELOG.md) for more information. - -### TypeProf - -* [Experimental IDE support](https://github.com/ruby/typeprof/blob/master/doc/ide.md) has been implemented. -* Many bug fixes and performance improvements since Ruby 3.0.0. - -## Debugger - -* A new debugger [debug.gem](https://github.com/ruby/debug) is bundled. - debug.gem is a fast debugger implementation, and it provides many features - like remote debugging, colorful REPL, IDE (VSCode) integration, and more. - It replaces `lib/debug.rb` standard library. - -* `rdbg` command is also installed into `bin/` directory to start and control - debugging execution. - -## error_highlight - -A built-in gem called error_highlight has been introduced. -It shows fine-grained error locations in the backtrace. - -Example: `title = json[:article][:title]` - -If `json` is nil, it shows: +## Implementation improvements -``` -$ ruby test.rb -test.rb:2:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError) +### Ractor -title = json[:article][:title] - ^^^^^^^^^^ -``` +A lot of work has gone into making Ractors more stable, performant, and usable. These improvements bring Ractor implementation closer to leaving experimental status. -If `json[:article]` returns nil, it shows: +## JIT -``` -$ ruby test.rb -test.rb:2:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError) - -title = json[:article][:title] - ^^^^^^^^ -``` - -This feature is enabled by default. -You can disable it by using a command-line option `--disable-error_highlight`. -See [the repository](https://github.com/ruby/error_highlight) in detail. - -## IRB Autocomplete and Document Display - -The IRB now has an autocomplete feature, where you can just type in the code, and the completion candidates dialog will appear. You can use Tab and Shift+Tab to move up and down. - -If documents are installed when you select a completion candidate, the documentation dialog will appear next to the completion candidates dialog, showing part of the content. You can read the full document by pressing Alt+d. - -## Miscellaneous changes - -* lib/objspace/trace.rb is added, which is a tool for tracing the object - allocation. Just by requiring this file, tracing is started *immediately*. - Just by `Kernel#p`, you can investigate where an object was created. - Note that just requiring this file brings a large performance overhead. - This is only for debugging purposes. Do not use this in production. - [[Feature #17762]] - -* Now exceptions raised in finalizers will be printed to `STDERR`, unless - `$VERBOSE` is `nil`. [[Feature #17798]] - -* `ruby -run -e httpd` displays URLs to access. [[Feature #17847]] - -* Add `ruby -run -e colorize` to colorize Ruby code using - `IRB::Color.colorize_code`. - -[Bug #4443]: https://bugs.ruby-lang.org/issues/4443 -[Feature #6210]: https://bugs.ruby-lang.org/issues/6210 -[Feature #10917]: https://bugs.ruby-lang.org/issues/10917 -[Feature #11256]: https://bugs.ruby-lang.org/issues/11256 -[Feature #11689]: https://bugs.ruby-lang.org/issues/11689 -[Feature #12194]: https://bugs.ruby-lang.org/issues/12194 -[Feature #12495]: https://bugs.ruby-lang.org/issues/12495 -[Feature #12913]: https://bugs.ruby-lang.org/issues/12913 -[Feature #14256]: https://bugs.ruby-lang.org/issues/14256 -[Feature #14579]: https://bugs.ruby-lang.org/issues/14579 -[Feature #15198]: https://bugs.ruby-lang.org/issues/15198 -[Feature #15211]: https://bugs.ruby-lang.org/issues/15211 -[Feature #15912]: https://bugs.ruby-lang.org/issues/15912 -[Feature #16043]: https://bugs.ruby-lang.org/issues/16043 -[Feature #16182]: https://bugs.ruby-lang.org/issues/16182 -[Feature #16806]: https://bugs.ruby-lang.org/issues/16806 -[Feature #17312]: https://bugs.ruby-lang.org/issues/17312 -[Feature #17327]: https://bugs.ruby-lang.org/issues/17327 -[Feature #17370]: https://bugs.ruby-lang.org/issues/17370 -[Feature #17398]: https://bugs.ruby-lang.org/issues/17398 -[Feature #17411]: https://bugs.ruby-lang.org/issues/17411 -[Bug #17423]: https://bugs.ruby-lang.org/issues/17423 -[Bug #17429]: https://bugs.ruby-lang.org/issues/17429 -[Feature #17470]: https://bugs.ruby-lang.org/issues/17470 -[Feature #17479]: https://bugs.ruby-lang.org/issues/17479 -[Feature #17485]: https://bugs.ruby-lang.org/issues/17485 -[Feature #17544]: https://bugs.ruby-lang.org/issues/17544 -[Feature #17592]: https://bugs.ruby-lang.org/issues/17592 -[Feature #17684]: https://bugs.ruby-lang.org/issues/17684 -[Feature #17724]: https://bugs.ruby-lang.org/issues/17724 -[Feature #17744]: https://bugs.ruby-lang.org/issues/17744 -[Feature #17750]: https://bugs.ruby-lang.org/issues/17750 -[Feature #17762]: https://bugs.ruby-lang.org/issues/17762 -[Feature #17763]: https://bugs.ruby-lang.org/issues/17763 -[Feature #17795]: https://bugs.ruby-lang.org/issues/17795 -[Feature #17798]: https://bugs.ruby-lang.org/issues/17798 -[Bug #17827]: https://bugs.ruby-lang.org/issues/17827 -[Feature #17847]: https://bugs.ruby-lang.org/issues/17847 -[Feature #17853]: https://bugs.ruby-lang.org/issues/17853 -[Bug #17866]: https://bugs.ruby-lang.org/issues/17866 -[Bug #18003]: https://bugs.ruby-lang.org/issues/18003 -[Feature #18008]: https://bugs.ruby-lang.org/issues/18008 -[Feature #18015]: https://bugs.ruby-lang.org/issues/18015 -[Feature #18020]: https://bugs.ruby-lang.org/issues/18020 -[Feature #18029]: https://bugs.ruby-lang.org/issues/18029 -[Feature #18045]: https://bugs.ruby-lang.org/issues/18045 -[Feature #18148]: https://bugs.ruby-lang.org/issues/18148 -[Feature #18172]: https://bugs.ruby-lang.org/issues/18172 -[Feature #18176]: https://bugs.ruby-lang.org/issues/18176 -[Feature #18190]: https://bugs.ruby-lang.org/issues/18190 -[Feature #18229]: https://bugs.ruby-lang.org/issues/18229 -[Feature #18239]: https://bugs.ruby-lang.org/issues/18239 -[Feature #18254]: https://bugs.ruby-lang.org/issues/18254 -[Feature #18273]: https://bugs.ruby-lang.org/issues/18273 -[Feature #18290]: https://bugs.ruby-lang.org/issues/18290 - -[GH-1509]: https://github.com/ruby/ruby/pull/1509 -[GH-4815]: https://github.com/ruby/ruby/pull/4815 -[GH-5112]: https://github.com/ruby/ruby/pull/5112 -[GH-5131]: https://github.com/ruby/ruby/pull/5131 -[GH-5146]: https://github.com/ruby/ruby/pull/5146 +[Feature #8948]: https://bugs.ruby-lang.org/issues/8948 +[Feature #15330]: https://bugs.ruby-lang.org/issues/15330 +[Feature #21390]: https://bugs.ruby-lang.org/issues/21390 +[Feature #21768]: https://bugs.ruby-lang.org/issues/21768 +[Feature #21785]: https://bugs.ruby-lang.org/issues/21785 +[Feature #21796]: https://bugs.ruby-lang.org/issues/21796 +[Feature #21853]: 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