File: issue-34373.rs

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#![allow(warnings)]

trait Trait<T> {
    fn foo(_: T) {}
}

pub struct Foo<T = Box<Trait<DefaultFoo>>>;  //~ ERROR cycle detected
//~^ ERROR `T` is never used
//~| ERROR `Trait` cannot be made into an object
type DefaultFoo = Foo;

fn main() {
}