1 // Adapted from rustc run-pass test suite
3 #![feature(arbitrary_self_types, unsize, coerce_unsized, dispatch_from_dyn)]
6 ops::{Deref, CoerceUnsized, DispatchFromDyn},
10 struct Ptr<T: ?Sized>(Box<T>);
12 impl<T: ?Sized> Deref for Ptr<T> {
15 fn deref(&self) -> &T {
20 impl<T: Unsize<U> + ?Sized, U: ?Sized> CoerceUnsized<Ptr<U>> for Ptr<T> {}
21 impl<T: Unsize<U> + ?Sized, U: ?Sized> DispatchFromDyn<Ptr<U>> for Ptr<T> {}
23 struct Wrapper<T: ?Sized>(T);
25 impl<T: ?Sized> Deref for Wrapper<T> {
28 fn deref(&self) -> &T {
33 impl<T: CoerceUnsized<U>, U> CoerceUnsized<Wrapper<U>> for Wrapper<T> {}
34 impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<Wrapper<U>> for Wrapper<T> {}
38 // This method isn't object-safe yet. Unsized by-value `self` is object-safe (but not callable
39 // without unsized_locals), but wrappers around `Self` currently are not.
40 // FIXME (mikeyhew) uncomment this when unsized rvalues object-safety is implemented
41 // fn wrapper(self: Wrapper<Self>) -> i32;
42 fn ptr_wrapper(self: Ptr<Wrapper<Self>>) -> i32;
43 fn wrapper_ptr(self: Wrapper<Ptr<Self>>) -> i32;
44 fn wrapper_ptr_wrapper(self: Wrapper<Ptr<Wrapper<Self>>>) -> i32;
48 fn ptr_wrapper(self: Ptr<Wrapper<Self>>) -> i32 {
51 fn wrapper_ptr(self: Wrapper<Ptr<Self>>) -> i32 {
54 fn wrapper_ptr_wrapper(self: Wrapper<Ptr<Wrapper<Self>>>) -> i32 {
60 let pw = Ptr(Box::new(Wrapper(5))) as Ptr<Wrapper<dyn Trait>>;
61 assert_eq!(pw.ptr_wrapper(), 5);
63 let wp = Wrapper(Ptr(Box::new(6))) as Wrapper<Ptr<dyn Trait>>;
64 assert_eq!(wp.wrapper_ptr(), 6);
66 let wpw = Wrapper(Ptr(Box::new(Wrapper(7)))) as Wrapper<Ptr<Wrapper<dyn Trait>>>;
67 assert_eq!(wpw.wrapper_ptr_wrapper(), 7);