我正在为Map T,T编写我自己的半群。函数的逻辑如下:如果有不同的键,则应将值添加到结果映射中。我编写了这个函数,但遇到了一个问题:get(key)方法不仅返回T,还返回Option[T]。 extension (left: T) def combine(right: T): T
given Semigroup[Int] w
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