[ruby-core:98560] [Ruby master Feature#16378] Support leading arguments together with ...

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


Eregon (Benoit Daloze) wrote in #note-10:
> @jeremyevans0 or @nobu Could you implement it on `master`?

I've implemented basic support, which passes make check: https://github.com/jeremyevans/ruby/commit/672901facca6f88ae40b4ea8ef59ef04efd5a5de

I think ripper support is probably broken for it, and the idFWD_KWREST sections (not currently enabled) are probably also wrong.

@nobu, could you please fix the ripper support and idFWD_KWREST sections?

----------------------------------------
Feature #16378: Support leading arguments together with ...
https://bugs.ruby-lang.org/issues/16378#change-85857

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* 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.



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