[ruby-core:96769] [Ruby master Bug#16500] Argument added both to splat and last &block argument

Issue #16500 has been reported by anatolik (Anatol Pomozov).

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Bug #16500: Argument added both to splat and last &block argument
https://bugs.ruby-lang.org/issues/16500

* Author: anatolik (Anatol Pomozov)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.7.0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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Here is a followup for a ruby2.7 issue discussed here https://gitlab.com/groups/gitlab-org/-/epics/2380

I run gitlab with ruby2.7. Things work mostly fine except one weird issue. gitlab/lib/api/api_guard.rb calls Rack's `use` method:


```ruby
  use Rack::OAuth2::Server::Resource::Bearer, 'The API' do |request|
    # The authenticator only fetches the raw token string

    # Must yield access token to store it in the env
    request.access_token
  end

```

The `use` method looks like
```ruby
    def use(middleware, *args, &block)
      if @map
        mapping, @map = @map, nil
        @use << proc { |app| generate_map app, mapping }
      end
      @use << proc { |app| middleware.new(app, *args, &block) }
    end
```

For some reason `Proc` method set to `&block` *and* added to `args`. It sounds wrong. `Proc` should be set to `&block` only and `args` should contain only 1 argument.



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