class Bundler::RubygemsIntegration

def redefine_method(klass, method, unbound_method = nil, &block)
  visibility = method_visibility(klass, method)
  begin
    if (instance_method = klass.instance_method(method)) && method != :initialize
      # doing this to ensure we also get private methods
      klass.send(:remove_method, method)
    end
  rescue NameError
    # method isn't defined
    nil
  end
  @replaced_methods[[method, klass]] = instance_method
  if unbound_method
    klass.send(:define_method, method, unbound_method)
    klass.send(visibility, method)
  elsif block
    klass.send(:define_method, method, &block)
    klass.send(visibility, method)
  end
end