rust/tests/ui/borrowck/borrowck-union-move-assign.rs
2023-01-11 09:32:08 +00:00

33 lines
657 B
Rust

use std::mem::ManuallyDrop;
// Non-copy
struct A;
struct B;
union U {
a: ManuallyDrop<A>,
b: ManuallyDrop<B>,
}
fn main() {
unsafe {
{
let mut u = U { a: ManuallyDrop::new(A) };
let a = u.a;
let a = u.a; //~ ERROR use of moved value: `u`
}
{
let mut u = U { a: ManuallyDrop::new(A) };
let a = u.a;
u.a = ManuallyDrop::new(A);
let a = u.a; // OK
}
{
let mut u = U { a: ManuallyDrop::new(A) };
let a = u.a;
u.b = ManuallyDrop::new(B);
let a = u.a; // OK
}
}
}