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
|
#![allow(bare_trait_objects)]
trait NotObjectSafe {
fn foo() -> Self;
}
struct A;
struct B;
impl NotObjectSafe for A {
fn foo() -> Self {
A
}
}
impl NotObjectSafe for B {
fn foo() -> Self {
B
}
}
fn car() -> dyn NotObjectSafe { //~ ERROR the trait `NotObjectSafe` cannot be made into an object
if true {
return A;
}
B
}
fn cat() -> Box<dyn NotObjectSafe> { //~ ERROR the trait `NotObjectSafe` cannot be made into an
if true {
return Box::new(A);
}
Box::new(B)
}
fn main() {}
|