class Bundler::RubyVersion

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