package Ġderive an . upgrade . u 2 0 2 0 _ 1 1 _ 1 7 Ċ Ċ import Ġderive an . server . king dom . King dom Building Csv Ċ import Ġle ight . container . I Container Ċ import Ġle ight . upgrade . Abstract Upgrade Ċ Ċ @ Experimental Std lib Api Ċ class Ġu 2 0 2 0 _ 1 1 _ 1 7 _ 0 4 ( container : ĠI Container ) Ġ: ĠAbstract Upgrade ( container ) Ġ{ Ċ ĉ private Ġval Ġking dom Building Csv : ĠKing dom Building Csv Ġby Ġcontainer . lazy () ĊĊ ĉ override Ġfun Ġupgrade () Ġ{ Ċĉ ĉ storage . write Ġ{ Ċĉĉ ĉ king dom Building Csv . import (" upgrade / u 2 0 2 0 _ 1 1 _ 1 7 / king dom - build ings . csv ") Ċĉ ĉ } Ċ ĉ } Ċ } Ċ