Issue #11213 has been updated by Koichi Sasada.


However it is difficult because we can't call `self.respond_to_,missing?` directly because we should ignore `C1#respond_to_missing?`.

Options:
(1) Ignore this issue as a spec (or known issue)
(2) Do `super` (it has compatibility issue)
(3) Introduce something special to call `respond_to_,missing?`

My recommendation is (1).


----------------------------------------
Bug #11213: defined?(super) ignores respond_to_missing?
https://bugs.ruby-lang.org/issues/11213#change-52721

* Author: Koichi Sasada
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
* ruby -v: 2.3dev
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
```ruby
class C0
  def method_missing *args
    p [:method_missing] + args
  end
  def respond_to_missing? *args
    true
  end
end

class C1 < C0
  def foo
    super
    defined?(super)
  end
end

p C1.new.foo
```

This script prints

```
[:method_missing, :foo]
nil
```

In this case, we can call super, but defined? returns nil.
It should be a bug.




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