December 2024 - ruby-core - ml.ruby-lang.org

[ruby-core:118284] [Ruby master Misc#20575] Syntax Moratorium til 3.4
by matz (Yukihiro Matsumoto) 13 Jan '25

13 Jan '25

Issue #20575 has been reported by matz (Yukihiro Matsumoto). ---------------------------------------- Misc #20575: Syntax Moratorium til 3.4 https://bugs.ruby-lang.org/issues/20575 * Author: matz (Yukihiro Matsumoto) * Status: Open ---------------------------------------- Hi, As some may remember from the closing keynote at RubyKaigi, we are introducing Syntax Moratorium to support fair development of parsers. During the Syntax Moratorium period, new syntactical changes will be suspended (changes not includes bug fixes, of course). The moratorium period is scheduled to end with the release of 3.4, since the respective parser developers told us they did not need a very long period of time. Matz. -- https://bugs.ruby-lang.org/

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[ruby-core:119944] [Ruby master Feature#20899] Reconsider adding `Array#find_map`
by toy (Ivan Kuchin) 12 Jan '25

12 Jan '25

Issue #20899 has been reported by toy (Ivan Kuchin). ---------------------------------------- Feature #20899: Reconsider adding `Array#find_map` https://bugs.ruby-lang.org/issues/20899 * Author: toy (Ivan Kuchin) * Status: Open ---------------------------------------- I would like to retry proposing method `Array#find_map` that was rejected in [8421](https://bugs.ruby-lang.org/issues/8421) which happened before introduction of `filter_map` in [15323](https://bugs.ruby-lang.org/issues/15323). It would make code nicer whenever there is a need to get the first truthy result of applying some code. Adapting examples from `filter_map` documentation, but if I need only the first value: ```rb (1..9).find_map {|i| i * 2 if i.even? } # => 4 {foo: 0, bar: 1, baz: 2}.find_map {|key, value| key if value.even? } # => :foo ``` Or an example of getting match group for first successful match: ```rb list = ['some 123', 'list 234', 'of 345', 'strings 456'] list.find_map{ |s| s[/\Aof (\d+)\z/, 1] } # => "345" ``` Currently I imagine either more code and/or inefficiency (extra calls and/or objects): ```rb # code called twice list.find{ |s| s[/\Aof (\d+)\z/, 1] }&.then{ |s| s[/\Aof (\d+)\z/, 1] } # => "345" # more logic result = nil list.each do |s| break if (result = s[/\Aof (\d+)\z/, 1]) end result # => "345" # or result = nil list.find do |s| result = s[/\Aof (\d+)\z/, 1] end result # => "345" # extra calls for items which come after item that we were looking for list.map{ |s| s[/\Aof (\d+)\z/, 1] }.find{ _1 } # => "345" # using lazy list.lazy.map{ |s| s[/\Aof (\d+)\z/, 1] }.find{ _1 } # => "345" # or as suggested by @alexbarret in https://bugs.ruby-lang.org/issues/8421?tab=history#note-7 list.lazy.filter_map{ |s| s[/\Aof (\d+)\z/, 1] }.first # => "345" # using tricks, as suggested by @zverok in https://bugs.ruby-lang.org/issues/8421?tab=history#note-4 list.find{ |s| result = s[/\Aof (\d+)\z/, 1] and break result } # => "345" ``` Implementation in ruby can be: ```rb Enumerable.class_eval do def find_map(&block) each do |element| block_result = block.call(element) return block_result if block_result end nil end end ``` An example from another language - scala method [`collect`](https://www.scala-lang.org/api/3.5.2/scala/collection/ArrayOps.html#collect-68e) works alike `filter_map` and [`collectFirst`](https://www.scala-lang.org/api/3.5.2/scala/collection/ArrayOps.html#collectFirst-25d) would be like `find_map`. -- https://bugs.ruby-lang.org/

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[ruby-core:119272] [Ruby master Feature#20757] Make rb_tracearg_(parameters|eval_script|instruction_sequence) public C-API
by richardboehme 11 Jan '25

11 Jan '25

Issue #20757 has been reported by richardboehme (Richard Böhme). ---------------------------------------- Feature #20757: Make rb_tracearg_(parameters|eval_script|instruction_sequence) public C-API https://bugs.ruby-lang.org/issues/20757 * Author: richardboehme (Richard Böhme) * Status: Open ---------------------------------------- **Abstract** As a C-extension developer when using tracepoints I include "ruby/debug.h". This includes most of TracePoint's API but it seems like the C-equivalents for TracePoint#parameters, TracePoint#eval_script and TracePoint#instruction_sequence are missing/not being exported in the header. **Background** Most APIs like rb_tracearg_return_value are exported in "ruby/debug.h". If I understand correctly, the implementations for those methods are located in "ruby/vm_trace.c". The following methods implemented in "ruby/vm_trace.c" are missing in "ruby/debug.h": * rb_tracearg_parameters * rb_tracearg_eval_script * rb_tracearg_instruction_sequence **Proposal** I propose to add those methods to "ruby/debug.h". From my limiting understanding the change should be simple and not break backward compatibility, because we'd only need to add those function declarations to "ruby/debug.h". I'd be open to contribute this change if it was approved. **Use cases** I'm implementing a method call tracer for Ruby using the C-extension API. I wanted to get information about the parameters that the called method receives. When writing in Ruby this can be done using the TracePoint#parameters method, but I could not find the equivalent C-API. A workaround is to retrieve the method object (using the method_id) and check the method parameters. **See also** * Implementation of TracePoint#parameters in #14694 * Implementation of TracePoint#eval_script and TracePoint#instruction_sequence in #15287 -- https://bugs.ruby-lang.org/

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[ruby-core:117826] [Ruby master Bug#20480] Complie failure for unable to configure NET_LUID using msys2 mingw64-gcc
by nekoyama32767 (Jinsong Yu) 09 Jan '25

09 Jan '25

Issue #20480 has been reported by nekoyama32767 (Jinsong Yu). ---------------------------------------- Bug #20480: Complie failure for unable to configure NET_LUID using msys2 mingw64-gcc https://bugs.ruby-lang.org/issues/20480 * Author: nekoyama32767 (Jinsong Yu) * Status: Open * ruby -v: ruby 3.4.0dev (2024-05-10T04:54:31Z master 2f915e729a) [x64-mingw32] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- Master commit:`2f915e729ac8c66f4009f4b28a57773923d7e7d1` NET_LUID is not successfully checked in win32 configure. When try to compile in msys2 mingw64-gcc there will be a error message like follow. ``` win32/win32.c:4365:7: error: conflicting types for 'NET_LUID'; have 'struct <anonymous>' 4365 | } NET_LUID; | ^~~~~~~~ In file included from D:/msys64/mingw64/include/iptypes.h:17, from D:/msys64/mingw64/include/iphlpapi.h:17, from ./include/ruby/win32.h:40, from ./include/ruby/internal/dosish.h:38, from ./include/ruby/defines.h:78, from ./include/ruby/ruby.h:25, from win32/win32.c:24: D:/msys64/mingw64/include/ifdef.h:106:3: note: previous declaration of 'NET_LUID' with type 'NET_LUID' 106 | } NET_LUID, *PNET_LUID; | ^~~~~~~~ ``` Mingw64-gcc has NET_LUID, when comment out line 4357-line 4367 in `win32/win32.c` in follow, compile will be successed. ``` #ifndef HAVE_TYPE_NET_LUID typedef struct { uint64_t Value; struct { uint64_t Reserved :24; uint64_t NetLuidIndex :24; uint64_t IfType :16; } Info; } NET_LUID; #endif ``` mingw64-gcc version ``` gcc --version gcc.exe (Rev4, Built by MSYS2 project) 13.2.0 Copyright (C) 2023 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ``` -- https://bugs.ruby-lang.org/

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[ruby-core:120397] [Ruby master Bug#20980] Range#size new TypeError vs semi-open ranges
by zverok (Victor Shepelev) 09 Jan '25

09 Jan '25

Issue #20980 has been reported by zverok (Victor Shepelev). ---------------------------------------- Bug #20980: Range#size new TypeError vs semi-open ranges https://bugs.ruby-lang.org/issues/20980 * Author: zverok (Victor Shepelev) * Status: Open * ruby -v: ruby 3.4.0dev (2024-12-24T14:40:12Z master 07e89bde46) +PRISM [x86_64-linux] * Backport: 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED ---------------------------------------- Since #18984, `Range#size` throws `TypeError` if the `begin` is not iterable (doesn't respond to `#succ`). It produces one small inconvenience compared to 3.3: ```ruby ('a'..).size #=> nil (..'a').size # 3.3: nil # 3.4: can't iterate from NilClass (TypeError) -- well, probably makes sense # BUT: (3..).size #=> Infinity -- cool! (..3).size # 3.3: Infinity -- reasonable? # 3.4: can't iterate from NilClass (TypeError) -- worse? ``` I believe that while 3.4's behavior is explainable, 3.3's one has better DX. (Obviously too late to change before the release, but maybe might be considered for some patch version or Ruby 3.5?..) -- https://bugs.ruby-lang.org/

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[ruby-core:120350] [Ruby master Bug#20974] Required and optional anonymous parameter show differently in Proc#parameters
by alanwu (Alan Wu) 09 Jan '25

09 Jan '25

Issue #20974 has been reported by alanwu (Alan Wu). ---------------------------------------- Bug #20974: Required and optional anonymous parameter show differently in Proc#parameters https://bugs.ruby-lang.org/issues/20974 * Author: alanwu (Alan Wu) * Status: Open * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- The following has had the same output since Ruby 1.9, when Proc#parameters was [introduced]: ```ruby p(proc { |(_a)| }.parameters) # => [[:opt, nil]] p(lambda { |(_a)| }.parameters) # => [[:req]] ``` I think they should be `[[:opt]]` and `[[:req]]` or `[[:opt, nil]]` and `[[:req, nil]]`. I prefer the nil-free option since that feels more anonymous. [added]: https://docs.ruby-lang.org/en/master/NEWS/NEWS-1_9_2.html -- https://bugs.ruby-lang.org/

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[ruby-core:120428] [Ruby master Feature#20987] Add dbg - minimal debugging helper
by pawurb (Pawel Urbanek) 09 Jan '25

09 Jan '25

Issue #20987 has been reported by pawurb (Pawel Urbanek). ---------------------------------------- Feature #20987: Add dbg - minimal debugging helper https://bugs.ruby-lang.org/issues/20987 * Author: pawurb (Pawel Urbanek) * Status: Open ---------------------------------------- Hi. It's my first time contributing here, so I'm sorry in advance if I've mixed something up. I’m author of https://github.com/pawurb/dbg-rb gem. `dbg` method is inspired by Rust where it's built-in into std-lib (https://doc.rust-lang.org/std/macro.dbg.html) AFAIK in Ruby there's no simple mechanism to puts debug values together with caller info without using external dependencies. What’s more frustrating is that while `p nil` outputs `nil` to the std, `puts nil` prints a blank line, sometimes making debugging sessions confusing. I would like to propose adding a minimal `dbg` helper method to stdlib: ``` dbg("Hello world", [1, 2, 3]) # => [dir/file.rb:12] "Hello world" # => [dir/file.rb:12] [1, 2, 3] ``` `dbg` will produce verbose output together with informative file name and LOC info. I think that such built-in feature would be useful for many Ruby devs. My gem uses external dependencies, but I've came up with this barebones implementation: ``` def dbg(*msgs) loc = caller_locations.first.to_s matching_loc = loc.match(/.+(rb)\:\d+\:(in)\s/) src = if matching_loc.nil? loc else matching_loc[0][0..-5] end file, line = src.split(":") file = file.split("/").last(2).join("/") src = "[#{file}:#{line}]" msgs.each do |msg| puts "#{src} #{msg.inspect}" end nil end ``` ---Files-------------------------------- Screenshot 2024-12-27 at 00.00.23.png (81.5 KB) -- https://bugs.ruby-lang.org/

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[ruby-core:120445] [Ruby master Feature#20993] Allow `class <constant-path> = <expression>` syntax
by byroot (Jean Boussier) 08 Jan '25

08 Jan '25

Issue #20993 has been reported by byroot (Jean Boussier). ---------------------------------------- Feature #20993: Allow `class <constant-path> = <expression>` syntax https://bugs.ruby-lang.org/issues/20993 * Author: byroot (Jean Boussier) * Status: Open ---------------------------------------- This is meant as a solution for: https://bugs.ruby-lang.org/issues/20943 ## Context When using `Struct.new` or `Data.define`, you often see one of these patterns: ```ruby class MyStruct < Struct.new(:foo, :bar) # ... end ``` Or: ```ruby MyStruct = Struct.new(:foo, :bar) do # ... end ``` The first one is OK, but not ideal because `MyStruct` inherits from an anonymous class. That's not that big of a deal, but it's an extra, generally useless class: ```ruby >> MyClass.ancestors => [MyClass, #<Class:0x000000012a811548>, Struct, ...] ``` The second one is OK too, but can lead to two mistakes. First, since it doesn't create a nesting, if you assign a constant, it won't be set where you expect it. ```ruby MyStruct = Struct.new(:foo) do BAR = 1 # This sets Object::BAR, not MyStruct::BAR end ``` The second potential issue is that the class only get named after the block complete, so some `inherited` or `included` hooks that rely on the class name may break. ## Proposal The "ideal" way to define a `Struct` or `Data` would be: ```ruby MyStruct = Struct.new(:foo, :bar) class MyStruct # body end ``` But it's a bit awkward. Given that `class <constant-path> < <expression>` is valid, this makes me think we could also accept `class <constant-path> = <expression>` such as: ```ruby class MyStruct = Struct.new(:foo, :bar) # body end ``` Would be valid syntax and the recommended way to define `Struct` and `Data` classes. Of course `module <constant-path> = <expression>` would be valid as well. If the expression doesn't return the expected type (either `Class` or `Module`), it would raise a `TypeError`. -- https://bugs.ruby-lang.org/

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[ruby-core:120215] [Ruby master Misc#20949] DevMeeting-2025-01-09
by mame (Yusuke Endoh) 08 Jan '25

08 Jan '25

Issue #20949 has been reported by mame (Yusuke Endoh). ---------------------------------------- Misc #20949: DevMeeting-2025-01-09 https://bugs.ruby-lang.org/issues/20949 * Author: mame (Yusuke Endoh) * Status: Open ---------------------------------------- # The next dev meeting **Date: 2025/01/09 13:00-17:00** (JST) Log: *TBD* - Dev meeting *IS NOT* a decision-making place. All decisions should be done at the bug tracker. - Dev meeting is a place we can ask Matz, nobu, nurse and other developers directly. - Matz is a very busy person. Take this opportunity to ask him. If you can not attend, other attendees can ask instead of you (if attendees can understand your issue). - We will write a record of the discussion in the file or to each ticket in English. - All activities are best-effort (keep in mind that most of us are volunteer developers). - The date, time and place of the meeting are scheduled according to when/where we can reserve Matz's time. - *DO NOT* discuss then on this ticket, please. # Call for agenda items If you have a ticket that you want matz and committers to discuss, please post it into this ticket in the following format: ``` * [Ticket ref] Ticket title (your name) * Comment (A summary of the ticket, why you put this ticket here, what point should be discussed, etc.) ``` Example: ``` * [Feature #14609] `Kernel#p` without args shows the receiver (ko1) * I feel this feature is very useful and some people say :+1: so let discuss this feature. ``` - It is recommended to add a comment by 2025/01/06. We hold a preparatory meeting to create an agenda a few days before the dev-meeting. - The format is strict. We'll use [this script to automatically create an markdown-style agenda](https://gist.github.com/mame/b0390509ce1491b43610b9ebb665eb86). We may ignore a comment that does not follow the format. - Your comment is mandatory. We cannot read all discussion of the ticket in a limited time. We appreciate it if you could write a short summary and update from a previous discussion. -- https://bugs.ruby-lang.org/

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[ruby-core:120367] [Ruby master Bug#20978] Ractor[]/Thread[]/Fiber[] behavior difference
by zverok (Victor Shepelev) 07 Jan '25

07 Jan '25

Issue #20978 has been reported by zverok (Victor Shepelev). ---------------------------------------- Bug #20978: Ractor[]/Thread[]/Fiber[] behavior difference https://bugs.ruby-lang.org/issues/20978 * Author: zverok (Victor Shepelev) * Status: Open * ruby -v: ruby 3.4.0dev (2024-12-22T06:08:19Z master 3808d29e20) +PRISM [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- `Ractor.[]` and `.[]=` support string and symbol keys (treating them by string value, and also accepting anything responding to `#to_str`): ```ruby Ractor[:value] = 10 Ractor[:value] #=> 10 Ractor['value'] #=> 10 o = Object.new def o.to_str = 'value' Ractor[o] #=> 10 Ractor[1] # in 'Ractor.[]': 1 is not a symbol nor a string (TypeError) ``` But `Fiber.[]` only accept symbols: ```ruby Fiber[:value] = 10 Fiber['value'] # in 'Fiber.[]': wrong argument type String (expected Symbol) (TypeError) ``` `Thread#[]` and `#[]=` behave like Ractor’s. (The documentation for Fiber and Thread follows the reality—while Ractor’s current docs don’t specify key type at all—but the discrepancy feels somewhat weird.) -- https://bugs.ruby-lang.org/

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