class RuboCop::Cop::Style::Next

def on_block(node)
  block_owner, _, body = *node
  return unless block_owner.type == :send
  return if body.nil?
  _, method_name = *block_owner
  return unless enumerator?(method_name)
  return unless ends_with_condition?(body)
  add_offense(block_owner, :selector, MSG)
end