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//@ run-pass
#![feature(impl_trait_in_fn_trait_return)]
use std::fmt::Debug;
fn f_debug() -> impl Fn() -> impl Debug {
|| ()
}
fn ff_debug() -> impl Fn() -> impl Fn() -> impl Debug {
|| f_debug()
}
fn multi() -> impl Fn() -> (impl Debug + Send) {
|| ()
}
fn main() {
// Check that `ff_debug` is `() -> (() -> Debug)` and not `(() -> ()) -> Debug`
let debug = ff_debug()()();
assert_eq!(format!("{:?}", debug), "()");
let x = multi()();
assert_eq!(format!("{:?}", x), "()");
fn assert_send(_: &impl Send) {}
assert_send(&x);
}
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