Issue #18267 has been reported by tenderlovemaking (Aaron Patterson).

----------------------------------------
Bug #18267: Argument forwarding requires parenthesis on method definitions
https://bugs.ruby-lang.org/issues/18267

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0dev (2021-10-21T22:47:38Z master 844588f915) [x86_64-darwin20]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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I like to write my method definitions without parenthesis.  For example:

```ruby
def foo bar
  # ...
end
```

I tried to use `...`, but it doesn't work.  For example if I do:

```ruby
def call a, ...
  a.nil?(...)
end
```

It will be a syntax error, and the program exits.  Can we make this syntax work so that I can always omit parenthesis?

Thank you!



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