rust/tests/ui/union/issue-41073.rs
Michael Goulet 64eea3c47a Tweak E0740
2023-03-08 01:58:15 +00:00

23 lines
446 B
Rust

union Test {
a: A, //~ ERROR field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
b: B
}
#[derive(Debug)]
struct A(i32);
impl Drop for A {
fn drop(&mut self) { println!("A"); }
}
#[derive(Debug)]
struct B(f32);
impl Drop for B {
fn drop(&mut self) { println!("B"); }
}
fn main() {
let mut test = Test { a: A(3) };
println!("{:?}", unsafe { test.b });
unsafe { test.b = B(0.5); }
}