rust/tests/ui/issues/issue-59326.rs

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// check-pass
trait Service {
type S;
}
trait Framing {
type F;
}
impl Framing for () {
type F = ();
}
trait HttpService<F: Framing>: Service<S = F::F> {}
type BoxService = Box<dyn HttpService<(), S = ()>>;
fn build_server<F: FnOnce() -> BoxService>(_: F) {}
fn make_server<F: Framing>() -> Box<dyn HttpService<F, S = F::F>> {
unimplemented!()
}
fn main() {
build_server(|| make_server())
}