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// check-pass
#![feature(trait_alias)]
pub trait State = Clone + Send + Sync + PartialOrd + PartialEq + std::fmt::Display;
pub trait RandState<S: State> = FnMut() -> S + Send;
pub trait Evaluator {
type State;
}
pub struct Evolver<E: Evaluator> {
rand_state: Box<dyn RandState<E::State>>,
}
fn main() {}
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