Ruby » Ruby master

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Lately I came across some weird behavior with the (({defined?})) operator used to check if (({super})) keyword can be invoked in current context. Usually it works fine, but when I tried to combine the (({defined? super})) check with a tiny bit of metaprogramming, it gave me unexpected results.

Here's an example:

class A;
def self.def_f!;
singleton_class.send(:define_method, :f) { defined? super }
end
end
class AA < A; end

A.def_f!

A.f # => nil
AA.f # => nil

AA.def_f!

AA.f # => "super"
A.f # => "super" - WHY???

The last result is really strange, isn't it?

A.f has no super method, so I would expect the last (({A.f})) to return (({nil})).
Is it a bug?

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