From: "jeremyevans0 (Jeremy Evans) via ruby-core" <ruby-core@...>
Date: 2024-09-04T21:27:35+00:00
Subject: [ruby-core:119048] [Ruby master Feature#16378] Support leading arguments together with ...

Issue #16378 has been updated by jeremyevans0 (Jeremy Evans).


esad (Esad Hajdarevic) wrote in #note-21:
> Is there a reason why this doesn't work with keyword arguments too? 
> 
> For example:
> ```
> def foo(bar:, ...)
>    other(...)
> end
> ```
> 
> results in syntax error

Keyword arguments are not leading arguments.  Trying to support what you want was not in scope.  I think trying to support what you want would significantly increase the complexity, especially if you wanted to support `def foo(arg, kwarg: , ...)` as well.

You should use:

```ruby
def foo(*, bar:, **, &)
  other(*, **, &)
end
```

----------------------------------------
Feature #16378: Support leading arguments together with ...
https://bugs.ruby-lang.org/issues/16378#change-109626

* Author: Eregon (Benoit Daloze)
* Status: Closed
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 3.0
----------------------------------------
I think this is very important, otherwise `...` can be used only very rarely.

For instance, `method_missing` typically want to access the method name like:
```ruby
def method_missing(name, ...)
  if name.to_s.end_with?('?')
    self[name]
  else
    fallback(name, ...)
  end
end
```

See the original feature: https://bugs.ruby-lang.org/issues/16253#note-19.
I think most people expect `def method_missing(name, ...)` to work.

---Files--------------------------------
ruby_2_7_lead_args_forwarding.patch (8.98 KB)


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