From: "pabloh (Pablo Herrero) via ruby-core" <ruby-core@...>
Date: 2025-12-30T00:22:29+00:00
Subject: [ruby-core:124385] [Ruby Feature#21813] Add  [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`

Issue #21813 has been reported by pabloh (Pablo Herrero).

----------------------------------------
Feature #21813: Add  [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`
https://bugs.ruby-lang.org/issues/21813

* Author: pabloh (Pablo Herrero)
* Status: Open
----------------------------------------
When accessing `Method#parameters` for a method using forwarding parameters, an unexpected behavior arises:

```
def foo(*, **, &)
  "puts(#{(method(__method__).parameters.dig(0,1))})" # Fails!
end


def foo(...)
  "puts(#{(method(__method__).parameters.dig(0,1))})" # Works fine
end
```

It's very strange that you can't access the parameters, on `eval`, using the symbols provided at `Method#parameters`.

Adding `[:forward, :...]` or `[:forwarding, :...]` for those cases feels simply natural.




-- 
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