Issue #10659 has been updated by Yui NARUSE.

Backport changed from 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: REQUIRED to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONE

ruby_2_2 r49081 merged revision(s) 49041.

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Bug #10659: can't dup Fixnum (TypeError)
https://bugs.ruby-lang.org/issues/10659#change-50729

* Author: Janko Marohni
* Status: Closed
* Priority: Normal
* Assignee: 
* Category: core
* Target version: current: 2.2.0
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: DONE
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In Ruby 2.2 (older versions are good) there is a bug with unnamed keyword arguments when `super` is used.

```rb
module Foo
  def foo(**)
  end
end

class Bar
  include Foo

  def foo(bar: "bar", **)
    super
  end
end

Bar.new.foo # `dup': can't dup Fixnum (TypeError)
```

It happens when `super` is called. If I give the keyword arguments a name (`**` => `**options`) or if I remove the default keyword argument (`bar: "bar"`), the error doesn't happen.



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