Issue #19107 has been updated by k0kubun (Takashi Kokubun). Can we reconsider this? To Matz' question (see also: [DevMeeting-2022-12-01](https://github.com/ruby/dev-meeting-log/blob/master/2022/DevMeeting-2022-12-...)):

Is there an actual case where this proposal is convenient?

@byroot and I have shown real-world use cases in open-source repositories. In closed-source applications, e.g. at Shopify, it's common to see methods that have much more (optional, keyword) arguments, which would benefit from this syntax. At the Ruby Release 30th Party, in Koichi's presentation (which Matz missed), @byroot mentioned this feature as one of his wishes for the future of Ruby. IIRC, @shyouhei said this was rejected last time because this would cause a conflict in the syntax when parentheses are omitted. However, somebody else (I forgot, maybe @yui-knk or @nobu?) said some discrepancy between method definitions with parens and ones without parens already exist, and I'm sure we want this feature only when a method is defined with parens. So we shouldn't need to reject this for the previous reason. So, can we revisit this? Now that `it` is in, this is my most-wanted feature in Ruby now. I respect that there are people who don't put parens in method definitions (and therefore have no interest in this feature) or think trailing commas are awkward, but I'd like to remind you that there are other people who put parens in method definitions and want to minimize the git diff when a new parameter is added at the end of such method definitions with many parameters. ---------------------------------------- Feature #19107: Allow trailing comma in method signature https://bugs.ruby-lang.org/issues/19107#change-116080 * Author: byroot (Jean Boussier) * Status: Open ---------------------------------------- A popular style for multiline arrays, hashes or method calls, is to use trailing commas: ```ruby array = [ 1, 2, 3, ] hash = { foo: 1, bar: 2, baz: 3, } Some.method( 1, 2, foo: 3, ) ``` The main reason to do this is to avoid unnecessary noise when adding one extra element: ```diff diff --git a/foo.rb b/foo.rb index b2689a7e4f..ddb7dc3552 100644 --- a/foo.rb +++ b/foo.rb @@ -1,4 +1,5 @@ Foo.bar( foo: 1, - bar: 2 + bar: 2, + baz: 3 ) ``` However, this pattern doesn't work with method declarations: ```ruby def foo(bar:,) # syntax error, unexpected ')' ``` ### Proposal For consistency and convenience I propose to allow trailing commas in method declarations. -- https://bugs.ruby-lang.org/