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// issue: rust-lang/rust#106874
// ICE BoundUniversalRegionError
use std::marker::PhantomData;
use std::rc::Rc;
pub fn func<V, F: Fn(&mut V)>(f: F) -> A<impl X> {
A(B(C::new(D::new(move |st| f(st)))))
//~^ ERROR implementation of `FnOnce` is not general enough
//~| ERROR implementation of `Fn` is not general enough
//~| ERROR implementation of `FnOnce` is not general enough
//~| ERROR implementation of `FnOnce` is not general enough
//~| ERROR implementation of `Fn` is not general enough
//~| ERROR implementation of `FnOnce` is not general enough
//~| ERROR implementation of `Fn` is not general enough
//~| ERROR implementation of `FnOnce` is not general enough
//~| ERROR higher-ranked subtype error
//~| ERROR higher-ranked subtype error
}
trait X {}
trait Y {
type V;
}
struct A<T>(T);
struct B<T>(Rc<T>);
impl<T> X for B<T> {}
struct C<T: Y>(T::V);
impl<T: Y> C<T> {
fn new(_: T) -> Rc<Self> {
todo!()
}
}
struct D<V, F>(F, PhantomData<fn(&mut V)>);
impl<V, F> D<V, F> {
fn new(_: F) -> Self {
todo!()
}
}
impl<V, F: Fn(&mut V)> Y for D<V, F> {
type V = V;
}
pub fn main() {}
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