[ruby-core:97935] [Ruby master Feature#16796] Assigning local variables when using `case when regexp`

Issue #16796 has been reported by UlyssesZhan (有丘 詹).

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

* 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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