[ruby-core:97940] [Ruby master Feature#16796] Assigning local variables when using `case when regexp`

Issue #16796 has been updated by shyouhei (Shyouhei Urabe).


sawa (Tsuyoshi Sawada) wrote in #note-2:
> Alternatively, in order to access even unnamed matches, assigning the last matched data to a variable with the following syntax may be useful.
> 
> ```ruby
> case "str"
> when /s(.)r/ => match_data
>   match_data[1] # => "t"
> end
> ```

That's too confusing.  The following code works today.

```ruby
case "str"
in /s(.)r/ => match_data
  match_data[1] # => "t"
end
```

----------------------------------------
Feature #16796: Assigning local variables when using `case when regexp`
https://bugs.ruby-lang.org/issues/16796#change-85163

* Author: UlyssesZhan (有丘 詹)
* Status: Open
* Priority: Normal
----------------------------------------
I want to use
```ruby
case "str"
when /s(?<mid>.)r/
  p mid
end
```
instead of
```ruby
case
when /s(?<mid>.)r/ =~ "str"
  p mid
end
```
I also do not like using `$1`.

This feature is extremely useful when there are a lot of `when`s.



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