[ruby-core:97976] [Ruby master Bug#16801] The default Struct constructor improperly handle keyword arguments

Issue #16801 has been reported by byroot (Jean Boussier).

----------------------------------------
Bug #16801: The default Struct constructor improperly handle keyword arguments
https://bugs.ruby-lang.org/issues/16801

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Reproduction script:

```ruby
Field = Struct.new(:value) do
  def initialize(value, keyword: false)
    super(value)
    @keyword = keyword
  end
end

Field.new(1, keyword: true)
```

```
/tmp/kw.rb:8: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/tmp/kw.rb:2: warning: The called method `initialize' is defined here
```

This can be worked around with `keyword_init: true`, but I see no reason why `Struct` couldn't properly handle keyword arguments in it's default constructor.



I have a patch for this: https://github.com/ruby/ruby/pull/3045 however I had to modify a test that was explicitly expecting that warning, so maybe I'm missing something.



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