class RuboCop::Cop::Performance::Sum

def build_block_bad_method(method, init, var_acc, var_elem, body)
  bad_method = method.to_s
  unless init.empty?
    init = init.first
    bad_method += "(#{init.source})"
  end
  bad_method += " { |#{var_acc}, #{var_elem}| #{body.source} }"
  bad_method
end