# File lib/bundler/ruby_version.rb, line 47
    def diff(other)
      if engine != other.engine && @input_engine
        [:engine, engine, other.engine]
      elsif version != other.version
        [:version, version, other.version]
      elsif engine_version != other.engine_version && @input_engine
        [:engine_version, engine_version, other.engine_version]
      elsif patchlevel != other.patchlevel && @patchlevel
        [:patchlevel, patchlevel, other.patchlevel]
      end
    end