[ruby-core:102376] [Ruby master Bug#17558] ruby2_keywords ignores arguments after a block defined method

Issue #17558 has been updated by naruse (Yui NARUSE).

Backport changed from 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED, 3.0: REQUIRED to 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED, 3.0: DONE

ruby_3_0 0b372d9b1df46b82e5819d7592d1c6ba1eb866e1 merged revision(s) eeacdcb9a073c7d8ad703e0dc9faf229a5ebbe3c.

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Bug #17558: ruby2_keywords ignores arguments after a block defined method
https://bugs.ruby-lang.org/issues/17558#change-90237

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED, 3.0: DONE
----------------------------------------
The result of `foo_bar2` should be the same as `foo_bar1`.

```ruby
class C
  def bar(*args, **kw)
    [args, kw]
  end

  def nothing_1(*args)
  end

  define_method(:nothing_2) do |*args|
  end

  def foo_bar1(*args)
    bar(*args)
  end

  def foo_bar2(*args)
    bar(*args)
  end

  ruby2_keywords :nothing_1, :foo_bar1

  ruby2_keywords :nothing_2, :foo_bar2
end

c = C.new
p c.foo_bar1(a: 1) #=> [[], {:a=>1}]
p c.foo_bar2(a: 1) #=> [[{:a=>1}], {}]
```

[patch](https://github.com/ruby/ruby/pull/4096)



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