[ruby-core:124385] [Ruby Feature#21813] Add [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`

[ruby-core:124385] [Ruby Feature#21813] Add [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`

[pabloh (Pablo Herrero) via ruby-core]

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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[ruby-core:124499] [Ruby Feature#21813] Add [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`

[nobu (Nobuyoshi Nakada) via ruby-core]

Issue #21813 has been updated by nobu (Nobuyoshi Nakada).


`foo(a: 1)` doesn't print what you expect, I guess.

----------------------------------------
Feature #21813: Add  [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`
https://bugs.ruby-lang.org/issues/21813#change-116057

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

```ruby
def foo(*, **, &)
  binding.eval "print(#{(method(__method__).parameters.dig(0,1))})" # Works fine
end

foo(1,2,3,4) # => 1234

def bar(...)
  binding.eval "print(#{(method(__method__).parameters.dig(0,1))})" # Fails!
end

bar(1,2,3,3) # SyntaxError
```

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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[ruby-core:124524] [Ruby Feature#21813] Add [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`

[pabloh (Pablo Herrero) via ruby-core]

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


@nobu Perhaps I came up with a contrived example, but I wanted to point out that there is a lack of symmetry when it comes to `....`. As of right now, there is no way to know from the `Method` class API alone whether a method is using argument forwarding. You’d have to use Method#source_location and then parse the source file somehow.

----------------------------------------
Feature #21813: Add  [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`
https://bugs.ruby-lang.org/issues/21813#change-116085

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

```ruby
def foo(*, **, &)
  binding.eval "print(#{(method(__method__).parameters.dig(0,1))})" # Works fine
end

foo(1,2,3,4) # => 1234

def bar(...)
  binding.eval "print(#{(method(__method__).parameters.dig(0,1))})" # Fails!
end

bar(1,2,3,3) # SyntaxError
```

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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[ruby-core:124784] [Ruby Feature#21813] Add [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`

[matz (Yukihiro Matsumoto) via ruby-core]

Issue #21813 has been updated by matz (Yukihiro Matsumoto).

Status changed from Open to Rejected

I failed to persuade me. I admit there's a lack of symmetry, but I don't think it's not worth the potential performance burden.

Matz.


----------------------------------------
Feature #21813: Add  [:forward, :...] symbol tuple to indicate forwarding arguments when calling `Method#parameters`
https://bugs.ruby-lang.org/issues/21813#change-116395

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

```ruby
def foo(*, **, &)
  args = method(__method__).parameters.map(&:last).join(',')

  binding.eval "print(#{args})" # Works fine
end

foo(1,2,3,4, a: 23) # => 1234{a: 23}

def bar(...)
  args = method(__method__).parameters.map(&:last).join(',') 

  binding.eval "print(#{args})" # Fails!
end

bar(1,2,3,3, a: 23) # SyntaxError
```

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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