class RuboCop::Cop::Style::SelfAssignment

def check(node, var_type)
  return unless (rhs = node.expression)
  if rhs.send_type? && rhs.arguments.one?
    check_send_node(node, rhs, node.name, var_type)
  elsif rhs.operator_keyword?
    check_boolean_node(node, rhs, node.name, var_type)
  end
end