1 // Check that you can cast between different pointers to trait objects
2 // whose vtable have the same kind (both lengths, or both trait pointers).
5 fn foo(&self, _: T) -> u32 {
16 impl<T> Foo<T> for () {}
17 impl Foo<u32> for u32 {
18 fn foo(&self, _: u32) -> u32 {
24 unsafe fn round_trip_and_call<'a>(t: *const (dyn Foo<u32> + 'a)) -> u32 {
25 let foo_e: *const dyn Foo<u16> = t as *const _;
26 let r_1 = foo_e as *mut dyn Foo<u32>;
32 struct FooS<T: ?Sized>(T);
34 struct BarS<T: ?Sized>(T);
36 fn foo_to_bar<T: ?Sized>(u: *const FooS<T>) -> *const BarS<T> {
42 let y: &dyn Foo<u32> = &x;
43 let fl = unsafe { round_trip_and_call(y as *const dyn Foo<u32>) };
44 assert_eq!(fl, (43 + 4));
46 let s = FooS([0, 1, 2]);
47 let u: &FooS<[u32]> = &s;
48 let u: *const FooS<[u32]> = u;
49 let bar_ref: *const BarS<[u32]> = foo_to_bar(u);
50 let z: &BarS<[u32]> = unsafe { &*bar_ref };
51 assert_eq!(&z.0, &[0, 1, 2]);
52 // If validation fails here, that's likely because an immutable suspension is recovered mutably.