Incorrect “redundant self” after inner method definition

[noniq]

Given a method with a method parameter shadowing an instance method, RuboCop produces an incorrect “Redundant self detected” warning if (and only if) the method also contains an inner method definition:

class Foo
  attr_reader :bar

  def method(bar)
    def inner_method; end
    puts bar, self.bar # `bar` and `self.bar` are different!
  end
end

Without the inner method definition everything works correctly (i.e. no “redundant self” warning is produced).

---

Expected behavior

No warning about “redundant self” because in fact it is not redundant at this place.

Actual behavior

Warning “Redundant self detected”.

Steps to reproduce the problem

Run RuboCop on the example program given above.

RuboCop version

$ rubocop -V
0.42.0 (using Parser 2.3.1.2, running on ruby 2.1.6 x86_64-darwin14.0)
$ (cd rubocop && git rev-parse HEAD)
78de463f33992bce5b1ecf40e311958ad773bad5