[ruby-core:98880] [Ruby master Feature#16378] Support leading arguments together with ...

Issue #16378 has been updated by mame (Yusuke Endoh).


@nagachika Can we backport this to 2.7.2?  Strictly speaking, this is a new feature, but according to [public consultation about Ruby 3.0 keyword change](https://discuss.rubyonrails.org/t/new-2-7-3-0-keyword-argument-pain-point/74980), this seems important to mitigate the pain of the change in 2.7.  Matz also agreed with the backport.

@JeremyEvans0 If nagachika-san agreed with the backport, can you create a patch for backport?

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Feature #16378: Support leading arguments together with ...
https://bugs.ruby-lang.org/issues/16378#change-86255

* Author: Eregon (Benoit Daloze)
* Status: Closed
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 3.0
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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.



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