From: "austin (Austin Ziegler)" <noreply@...>
Date: 2022-11-10T15:20:51+00:00
Subject: [ruby-core:110694] [Ruby master Feature#19118] Allow numbered arguments to be inherited by block

Issue #19118 has been updated by austin (Austin Ziegler).


matz (Yukihiro Matsumoto) wrote in #note-1:
> I am sorry, but I don't think it's possible. `fork` or `Thread.new` may pass some values to the block that should be referenced by its own numbered parameters.
> 
> We have no way to distinguish whether it's possible to inherit outer ones or not.

This is *entirely* tongue-in-cheek, but we could count the number of underscores���

```ruby
[1,2,3].each do
  foo { puts(__1) }
end
```

And if the `it` proposal is ever accepted, we could count the number of `i`s:

```ruby
[1, 2, 3].each do
  foo { puts iit }
end
```

----------------------------------------
Feature #19118: Allow numbered arguments to be inherited by block
https://bugs.ruby-lang.org/issues/19118#change-100036

* Author: 0x1eef (0x 1eef)
* Status: Closed
* Priority: Normal
----------------------------------------
Each these examples does not work as I would have hoped - each of them evaluates to puts(nil). 

```ruby
def foo
  yield
end
[1,2,3].each do
  Process.wait fork { puts(_1) }
end
[1,2,3].each do
  Thread.new { puts(_1) }.join
end
[1,2,3].each do
  foo { puts(_1) }
end
```

Is it possible for numbered parameters to be inherited if the inner block is yielded with no arguments ?

Thanks!




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