Oct 2025 Meeting

calendar_today October 23, 2025 confirmation_number 31 tickets discussed Source English

DevMeeting-2025-10-23

https://bugs.ruby-lang.org/issues/21606

DateTime and location

  • 2025/10/23 (Tue) 13:00-17:00 JST @ Online

Next Date

  • 2025/11/13 (Tue) 13:00-17:00 JST @ Online

Announce

About release timeframe

Ordinary tickets

[Feature #21572] Make illegal variable in alternation pattern a syntax error (kddnewton)

  • Can we make this into a parse-time syntax error as opposed to a compiler error?

Preliminary discussion:

case foo
in { a: } | Array
  "matched: #{a}"
end

Discussion:

  • matz: parse error is definitely better
  • nobu: Should it render error when alternations have different variable definitons?
  • mame: seems alternations with local variables are totally NG

Conclusion:

  • matz: Accepted, waitning for implementations

[Misc #21609] Propose Stan Lo (@st0012) as a core committer (k0kubun)

  • To speed up the ZJIT development, can we let him merge his PRs by himself?

Preliminary discussion:

*

Discussion:

  • no objection

Conclusion:

  • matz: Go forward.

[Misc #21646] Propose Luke Gruber as a core committer (jhawthorn)

  • He’s been contributing to CRuby since 2019 fixing a variety of bugs and being active on redmine both filing and fixing issues. For the past few years he’s made a lot of improvements to help stabilize Ractors,

Preliminary discussion:

*

Discussion:

*

Conclusion:

  • matz: No objection!

[Feature #20163] Add Integer#popcount (tenderlovemaking)

  • Add a method for counting “on” bits in an integer
  • Raises an exception for negative numbers
  • Method would be helpful for bitsets, bitboards, and other data structures

Discussion:

  • matz: So what’s the use case?
  • akr: I can think of succinct data structures. See also [Feature #8748]
  • mame: Actually popcount against ruby’s bignum is less useful than other languages
  • akr: agreed because they are immutable.
  • nobu: What is actually needed is an array of bits?
  • nobu: Maybe we need popcount for strings in stead of integers
  • akr: strings are not XOR-able, which reduces its applicability.

Conclusion:

*

[Bug #21640] Core Pathname is missing 3 methods / is partially-defined (eregon)

  • This seems a bad user experience: partially-defined class missing some methods, require "pathname" doesn’t load the gem as expected (even with Bundler), etc
  • I think it would be better to keep Pathname as a default gem and not core, it avoids all 6 problems.
  • If we absolutely must have Pathname in core, how to fix these 6 problems then?

Discussion:

  • tmpdir.rb defines Dir#mktmpdir (and Dir::Tmpname)
  • it should also define Pathname#mktmpdir ?

Conclusion:

*

[Feature #21615] Introduce Array#values (matheusrich)

  • Seems reasonable to have an API to simplify traversal of hash/array values
  • There is some precedence, since both Hashes/Arrays have #values_at.
  • If approved, should it be added to Set too?

Conclusion:

  • matz: Hash and Array are not polymorphic. Will reject.

Ractor local GC

[#21616] date ライブラリを deprecated させたい

  • akr: localtime, fixoff, utcの3モードがある。
    • RDBからtimezoneのない、DateやTime型が返ってくる
    • Pythonだとnaiveとawareがある
    • Pythonでは常にawareを使えばよい
  • naruse: JavaやJavaScript (Temporal) ではUTCモード (Instant) のものをその用途に使っている
    • https://github.com/ruby/ruby/blob/3b190855ba965c179693a5baf25f365d9d445c09/timev.h#L20 実体としてはtzmode
  • nobu: UTCモードかはTime#utc?で判別出来ると見せかけて、offsetが0でも真を返すのは注意
  • akr: もともとはlocaltimeとgmtモード(後にutc)だったが、後にfixoffを加えた
  • https://www.rfc-editor.org/rfc/rfc9557#section-2.2
  • matsuda: いったんはRailsは気にせず進めて頂ければ

[#21573] Simpler syntax errors

current:

$ echo -e "1 +x 2 do\ndo" | ./miniruby -wc
-:1: warning: '+' after local variable or literal is interpreted as binary operator even though it seems like unary operator
-:1: warning: possibly useless use of + in void context
-:1: warning: possibly useless use of a literal in void context
./miniruby: -:1: syntax errors found (SyntaxError)
> 1 | 1 +x 2 do
    |      ^ unexpected integer, expecting end-of-input
    |        ^~ unexpected 'do', ignoring it
    |        ^~ unexpected 'do', expecting end-of-input
> 2 | do
    | ^~ unexpected 'do', ignoring it

The old style that flycheck (Emacs syntax check plugin for Ruby) supports

$ echo -e "1 +x 2 do\ndo" | RBENV_VERSION=3.3.1 ruby -wc
-:1: warning: `+' after local variable or literal is interpreted as binary operator
-:1: warning: even though it seems like unary operator
-:1: syntax error, unexpected integer literal, expecting `do' or '{' or '('
1 +x _2_ do
-: compile error (SyntaxError)

The new style proposed by kddnewton

$ echo -e "1 +x 2 do\ndo" | SIMPLE_ERROR=1 ./miniruby -wc
./miniruby: -:1: syntax errors found (SyntaxError)
-:1:5: unexpected integer, expecting end-of-input
-:1:7: unexpected 'do', expecting end-of-input
-:1:7: unexpected 'do', ignoring it
-:2:0: unexpected 'do', ignoring it

[#21168] a[cmd 1, 2 do end] and a[cmd 1, 2 do end] = 3

(timeout)

[#21552] allow String.strip and similar to take a parameter similar to String.delete

"fooab".chomp("ab") #=> "foo"
"fooba".chomp("ab") #=> "fooba"

"fooab".strip("ab") #=> "foo"
"fooba".strip("ab") #=> "foo"

[#7845] Strip doesn’t handle unicode space characters in ruby 1.9.2 & 1.9.3 (does in 1.9.1)

[#21554] Which make should be supported?

[#20437] Could the licensing conditions be made less ambiguous?

[#21625] Allow IO#wait_readable together with IO#ungetc

[#21634] Combining read(1) with eof? causes dropout of results unexpectedly on Windows

[#21619] logger: Context API

[#21617] Add Internationalized Domain Name (IDN) support to URI

[#21520] Feature Proposal: Enumerator::Lazy#tee

[#17316] On memoization

instance_variable_set_unless_defined(:@foo) do
  long_calc
end
instance_variable_set_if_absent(:@foo) do
  long_calc
end

akr: now because of object shape, “assign if absent” pattern is not a fast style.

[#12282] Hash#dig! for repeated applications of Hash#fetch

[#21545] #try_dig, a dig that returns early if it cannot dig deeper

[#21551] Ractor isolation error points to the wrong place

[#21564] Extend permutation, repeated_permutation, combination and repeated_combination arguments

# find right combination of letters
def brute_force
  [*'a'..'z'].repeated_permutation(*3..6).find do |chars|
    correct_combination?(chars)
  end
end

(3..6).flat_map { [*'a'...'z'].repeated_permutation(it).to_a }.find { ... }

def brute_force
  (3..6).each do |n|
    [*'a'..'z'].repeated_permutation(n) do |chars|
      return chars if correct_combination?(chars)
    end
  end
end

[#21622] Prism wrongly accepts command call to be a key of keyword argument

[#21618] Allow to use the build-in prism version to parse code

[#21630] Suggest @Earlopain for core contributor

[#15590] Add dups to Array to find duplicates

http://bugs.ruby-lang.org/issues/21446 StackOverflow when changing visibility in reopened refinement

[#21637] Tracing global variable assignment

[#21646] Propose Luke Gruber as a Ruby committer

[#21642] Introduce IO::ConnectionResetError and IO::BrokenPipeError as standardized IO-level exceptions

[#19017] Net::HTTP may block when attempting to reuse a persistent connection