class RuboCop::TargetRuby::GemspecFile

def find_minimal_known_ruby(right_hand_side)
  version = version_from_right_hand_side(right_hand_side)
  requirement = Gem::Requirement.new(version)
  KNOWN_RUBIES.detect { |v| requirement.satisfied_by?(Gem::Version.new("#{v}.99")) }
end