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约束的工作机制导致即使一个 trait 不包含任何功能，你仍然可以将其用作约束。std 库中的 Eq 和 Copy 就是这种 trait 的例子。
trait
std
Eq
Copy
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std::cmp::Eq、std::marker::Copy 和 trait
std::cmp::Eq
std::marker::Copy