From: "zverok (Victor Shepelev) via ruby-core" <ruby-core@...>
Date: 2023-11-01T14:17:22+00:00
Subject: [ruby-core:115220] [Ruby master Feature#19370] Anonymous parameters for blocks?

Issue #19370 has been updated by zverok (Victor Shepelev).


After considering some examples, I believe it would be more consistent to just allow anonymous parameters in blocks, without further restrictions.

The example of "confusing" example above:
```ruby
def test(*)
  # ...

  proc { |*| p(*) }.call(1) # which * is that?
end 
```
...can be rewritten with named arguments as well:
```ruby
def test(x)
  # ...

  proc { |x| p(x) }.call(1) # which x is that?
end 
```


In any case, the current behavior is the most confusing, as demonstrated by #19983

----------------------------------------
Feature #19370: Anonymous parameters for blocks?
https://bugs.ruby-lang.org/issues/19370#change-105137

* Author: zverok (Victor Shepelev)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
Just to clarify: are anonymous parameters delegation is planned to support in blocks? 

It would be a nice addition, if it is possible to implement:
```ruby
# data in form [request method, URL, params]:
[
  [:get, 'https://google.com', {q: 'Ruby'}, {'User-Argent': 'Google-Chrome'}],
  [:post, 'https://gist.github.com', 'body'],
  # ...
].each { |method, *| request(method.to_s.upcase, *) }
```
...and at the very least, consistent with what the method definition can have.

If they are NOT planned to be implemented, I believe that at least error messages should be made much clearer, because currently, this would happen while running the code above:
> no anonymous rest parameter (SyntaxError)

I understand the reason (the `request` clause doesn't "see" anonymous parameter of the **block**, and claims that current **method** doesn't have them), but it looks honestly confusing and inconsistent.



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