Issue #9299 has been updated by Yui NARUSE.

Status changed from Open to Feedback
Assignee changed from Yui NARUSE to Marc-Andre Lafortune

Like #8072, this is not a simple backport.
Please get confirmation by matz

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Backport #9299: Required keyowrd arguments and arity
https://bugs.ruby-lang.org/issues/9299#change-45392

* Author: Marc-Andre Lafortune
* Status: Feedback
* Priority: Normal
* Assignee: Marc-Andre Lafortune
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While fixing #8072, I noticed another bug: a required keyword argument should add 1 to the arity:

    proc{|required:|}.arity # => 0, should be 1



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