epub电子书问题修改
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@ -531,7 +531,7 @@ let evenInts: [Number] = [0, 2, 4, 6].map(f)
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为间接使用特殊的枚举用例,使用`indirect`声明修饰符标记。
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> enum Tree<T> {
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> enum Tree<T$gt; {
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> case Empty
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> indirect case Node(value: T, left: Tree, right:Tree)
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> }
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