1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
#![feature(unsize, dispatch_from_dyn)]
use std::{
ops::DispatchFromDyn,
marker::{Unsize, PhantomData},
};
struct WrapperWithExtraField<T>(T, i32);
impl<T, U> DispatchFromDyn<WrapperWithExtraField<U>> for WrapperWithExtraField<T>
where
T: DispatchFromDyn<U>,
{} //~^^^ ERROR [E0378]
struct MultiplePointers<T: ?Sized>{
ptr1: *const T,
ptr2: *const T,
}
impl<T: ?Sized, U: ?Sized> DispatchFromDyn<MultiplePointers<U>> for MultiplePointers<T>
where
T: Unsize<U>,
{} //~^^^ ERROR [E0378]
struct NothingToCoerce<T: ?Sized> {
data: PhantomData<T>,
}
impl<T: ?Sized, U: ?Sized> DispatchFromDyn<NothingToCoerce<T>> for NothingToCoerce<U> {}
//~^ ERROR [E0378]
#[repr(C)]
struct HasReprC<T: ?Sized>(Box<T>);
impl<T: ?Sized, U: ?Sized> DispatchFromDyn<HasReprC<U>> for HasReprC<T>
where
T: Unsize<U>,
{} //~^^^ ERROR [E0378]
fn main() {}
|
