class RBS::Writer

def name_and_params(name, params)
  if params.empty?
    "#{name}"
  else
    ps = params.each.map do |param|
      s = ""
      if param.skip_validation
        s << "unchecked "
      end
      case param.variance
      when :invariant
        # nop
      when :covariant
        s << "out "
      when :contravariant
        s << "in "
      end
      s + param.name.to_s
    end
    "#{name}[#{ps.join(", ")}]"
  end
end