Issue #16378 has been updated by Eregon (Benoit Daloze).


Also I believe `...` could be a good way to do delegation in all versions for lexical cases (the majority):
```ruby
# Could be some constant in a gem
ARGS = RUBY_VERSION < "2.7" ? "*args, &block" : "..."

class_eval <<RUBY
def method_missing(name, #{ARGS})
  if name.to_s.end_with?('?')
    self[name]
  else
    fallback(name, #{ARGS})
  end
end
RUBY
```

And while Redmine doesn't syntax highlight `<<RUBY`, at least GitHub and RubyMine do.

----------------------------------------
Feature #16378: Support leading arguments together with ...
https://bugs.ruby-lang.org/issues/16378#change-82830

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.7
----------------------------------------
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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