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// edition:2021
#![allow(bare_trait_objects)]
trait A: Sized {
fn f(a: dyn A) -> dyn A;
//~^ ERROR associated item referring to unboxed trait object for its own trait
//~| ERROR the trait `A` cannot be made into an object
}
trait B {
fn f(a: dyn B) -> dyn B;
//~^ ERROR associated item referring to unboxed trait object for its own trait
//~| ERROR the trait `B` cannot be made into an object
}
trait C {
fn f(&self, a: dyn C) -> dyn C;
}
fn main() {}
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