Issue #19107 has been updated by Earlopain (Earlopain _). Ah, sorry. That was about lambdas, not newlines. I'll wait until the logs are published and see if they came up. They were never mentioned explicitly but it should be very easy for prism to allow them if that changes. ---------------------------------------- Feature #19107: Allow trailing comma in method signature https://bugs.ruby-lang.org/issues/19107#change-116401 * Author: byroot (Jean Boussier) * Status: Open * Assignee: prism ---------------------------------------- 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/