class RuboCop::Cop::RSpec::MultipleMemoizedHelpers

def helpers(node)
  @example_group_memoized_helpers[node] ||=
    variable_nodes(node).map do |variable_node|
      if variable_node.block_type?
        variable_definition?(variable_node.send_node)
      else # block-pass (`let(:foo, &bar)`)
        variable_definition?(variable_node)
      end
    end
end