At a point that we want to handle the effects, you would put a block that will match on the effects used in the do expression. Currently in Swift this is the catch keyword, but since this has to be more general I think when is a better fit. It would read as “do that, and when this happens, do this other thing”.
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南方人物周刊：豆瓣上很多读者都在猜，最后开饭店的那对男女，到底是不是终成眷属的春芽和杜太白？读者仿佛对杜太白心有不忍，自动为他安排了这幸福的结局。