[ruby-dev:51203] [Ruby master Feature#19134] ** is not allowed in def foo(...)

Issue #19134 has been reported by shugo (Shugo Maeda).

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Feature #19134: ** is not allowed in def foo(...)
https://bugs.ruby-lang.org/issues/19134

* Author: shugo (Shugo Maeda)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
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`*` and `&` are allowed in the body of a method with `...` argument forwarding, but `**` is not allowed.

```
def foo(...)
  bar(*) # OK
  baz(&) # OK
  quux(**) # NG
end
```

Is it intended behavior?

It seems that parse.y has code like `#ifdef RUBY3_KEYWORDS`, and if RUBY3_KEYWORDS, `**` will also be supported.




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