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删除之前错误添加的extern crate rand
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@ -349,8 +349,6 @@ rand = "0.4.0"
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<span class="filename">文件名: src/main.rs</span>
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<span class="filename">文件名: src/main.rs</span>
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```rust,ignore
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```rust,ignore
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extern crate rand;
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use std::io;
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use std::io;
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use rand::Rng;
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use rand::Rng;
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