From: Hal Fulton <rubyhacker@...>
Date: 2011-07-14T10:03:45+09:00
Subject: Issue with: instance_variable_defined?

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I expect the third line to be true rather than false.

Comments?

Hal

class SomeClass
      attr_reader :a1, :a2    # Creates @a1, a1, @a2, a2
      attr_writer :b1, :b2    # Creates @b1, b1=, @b2, b2=
      attr_accessor :c1, :c2  # Creates @c1, c1, c1=, @c2, c2, c2=
      # ...
  def initialize
    @c2 = 99
  end
end

obj = SomeClass.new
p obj.instance_variable_defined?(:@c2)   # true
p obj.instance_variable_defined?(:@d2)   # false
p obj.instance_variable_defined?(:@a2)   # false  :-/

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