tests/ui/impl-trait/dyn-incompatible-trait-in-return-position-impl-trait.rs


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
43
44
45
46

trait DynIncompatible {
    fn foo() -> Self;
}

trait DynCompatible {
    fn bar(&self);
}

struct A;
struct B;

impl DynIncompatible for A {
    fn foo() -> Self {
        A
    }
}

impl DynIncompatible for B {
    fn foo() -> Self {
        B
    }
}

impl DynCompatible for A {
    fn bar(&self) {}
}

impl DynCompatible for B {
    fn bar(&self) {}
}

fn can() -> impl DynIncompatible {
    if true {
        return A;
    }
    B //~ ERROR mismatched types
}

fn cat() -> impl DynCompatible {
    if true {
        return A;
    }
    B //~ ERROR mismatched types
}

fn main() {}