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並前往https://stackoverflow.com/questions/70283784/why-do-i-need-use-randrng-to-call-gen-on-randthread-rng

Why do I need "use rand::Rng" to call gen() on rand - Stack ...

Otherwise, Rust won't see it. So, in your case, thread_rng() returns a rand::prelude::ThreadRng . The method gen is not defined on ...

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