class RuboCop::Cop::Style::ArgumentsForwarding::SendNodeClassifier

def ruby_30_or_lower_optarg?

def foo(a = 41, ...) is a syntax error in 3.0. 
def ruby_30_or_lower_optarg?
  target_ruby_version <= 3.0 && @def_node.arguments.any?(&:optarg_type?)
end