diff

# File lib/bundler/ruby_version.rb, line 87
    def diff(other)
      raise ArgumentError, "Can only diff with a RubyVersion, not a #{other.class}" unless other.is_a?(RubyVersion)
      if engine != other.engine && @input_engine
        [:engine, engine, other.engine]
      elsif versions.empty? || !matches?(versions, other.gem_version)
        [:version, versions_string(versions), versions_string(other.versions)]
      elsif @input_engine && !matches?(engine_versions, other.engine_gem_version)
        [:engine_version, versions_string(engine_versions), versions_string(other.engine_versions)]
      elsif patchlevel && (!patchlevel.is_a?(String) || !other.patchlevel.is_a?(String) || !matches?(patchlevel, other.patchlevel))
        [:patchlevel, patchlevel, other.patchlevel]
      end
    end