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omochimetaru 9/20/2018 7:50 AM
あーこれはassociatedtypeのデフォルト値か。
7:51 AM
/// The element type of the option set. /// /// To inherit all the default implementations from the `OptionSet` protocol, /// the `Element` type must be `Self`, the default. associatedtype Element = Self (edited)
7:53 AM
このコメントの must be はどういう意味です？