tests/ui/dst/dst-bad-coerce1.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

// Attempt to change the type as well as unsizing.

struct Fat<T: ?Sized> {
    ptr: T
}

struct Foo;
trait Bar { fn bar(&self) {} }

pub fn main() {
    // With a vec of isize.
    let f1 = Fat { ptr: [1, 2, 3] };
    let f2: &Fat<[isize; 3]> = &f1;
    let f3: &Fat<[usize]> = f2;
    //~^ ERROR mismatched types

    // With a trait.
    let f1 = Fat { ptr: Foo };
    let f2: &Fat<Foo> = &f1;
    let f3: &Fat<dyn Bar> = f2;
    //~^ ERROR `Foo: Bar` is not satisfied
}