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fix: url redirect

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Kunhao ZHENG 2020-06-04 17:33:29 +02:00 committed by GitHub
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@ -140,4 +140,4 @@ count after c goes out of scope = 2
通过不可变引用， `Rc<T>` 允许在程序的多个部分之间只读地共享数据。如果 `Rc<T>` 也允许多个可变引用，则会违反第四章讨论的借用规则之一：相同位置的多个可变借用可能造成数据竞争和不一致。不过可以修改数据是非常有用的！在下一部分，我们将讨论内部可变性模式和 `RefCell<T>` 类型，它可以与 `Rc<T>` 结合使用来处理不可变性的限制。
[preventing-ref-cycles]: ch15-06-reference-cycles.html#preventing-reference-cycles-turning-an-rct-into-a-weakt
[preventing-ref-cycles]: ch15-06-reference-cycles.html#避免引用循环将-rct-变为-weakt