Issue #16465 has been reported by mame (Yusuke Endoh).

----------------------------------------
Bug #16465: False keyword warning against Struct#initialize
https://bugs.ruby-lang.org/issues/16465

* Author: mame (Yusuke Endoh)
* Status: Open
* Priority: Normal
* Assignee: jeremyevans0 (Jeremy Evans)
* Target version: 
* ruby -v: ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
The following code is warned:

```ruby
Sample2 = Struct.new(:s1, :s2, :s3) do
    def initialize(a1:, a2:)
        super(a1, a2, a1 + a2)
    end
end
p Sample2.new(a1:1, a2:2)
#=> test.rb:6: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
#=> test.rb:2: warning: The called method `initialize' is defined here
```

I think the code is innocent and the warning is false positive.  I'll create a pull request.



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