2022-06-11 13:12:57 +08:00
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use std::mem::ManuallyDrop;
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2020-10-05 04:24:14 +08:00
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2017-05-18 05:22:52 +08:00
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union U1 { // OK
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2016-08-27 00:23:42 +08:00
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a: u8,
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}
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2016-08-18 23:31:47 +08:00
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2017-05-18 05:22:52 +08:00
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union U2<T: Copy> { // OK
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a: T,
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}
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2020-10-05 04:24:14 +08:00
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union U22<T> { // OK
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2022-06-11 13:12:57 +08:00
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a: ManuallyDrop<T>,
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}
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union U23<T> { // OK
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a: (ManuallyDrop<T>, i32),
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2020-10-05 04:24:14 +08:00
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}
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2022-06-20 00:57:07 +08:00
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union U24<T> { // OK
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a: [ManuallyDrop<T>; 2],
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}
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2020-10-05 04:24:14 +08:00
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union U3 {
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2023-03-08 06:26:52 +08:00
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a: String, //~ ERROR field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
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2017-05-18 05:22:52 +08:00
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}
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2022-06-30 10:33:18 +08:00
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union U32 { // field that does not drop but is not `Copy`, either
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2023-03-08 06:26:52 +08:00
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a: std::cell::RefCell<i32>, //~ ERROR field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
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2020-10-05 04:24:14 +08:00
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}
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union U4<T> {
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2023-03-08 06:26:52 +08:00
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a: T, //~ ERROR field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
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2017-05-18 05:22:52 +08:00
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}
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2020-10-05 04:24:14 +08:00
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union U5 { // Having a drop impl is OK
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2017-05-18 05:22:52 +08:00
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a: u8,
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}
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impl Drop for U5 {
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fn drop(&mut self) {}
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}
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2022-06-11 13:12:57 +08:00
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union U5Nested { // a nested union that drops is NOT OK
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2023-03-08 06:26:52 +08:00
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nest: U5, //~ ERROR field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
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2022-06-11 13:12:57 +08:00
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}
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2022-06-30 22:17:49 +08:00
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union U5Nested2 { // for now we don't special-case empty arrays
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2023-03-08 06:26:52 +08:00
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nest: [U5; 0], //~ ERROR field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
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2022-06-30 22:17:49 +08:00
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}
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2022-06-11 13:12:57 +08:00
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union U6 { // OK
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s: &'static i32,
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m: &'static mut i32,
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}
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union U7<T> { // OK
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f: (&'static mut i32, ManuallyDrop<T>, i32),
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}
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2022-06-30 22:17:49 +08:00
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union U8<T> { // OK
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f1: [(&'static mut i32, i32); 8],
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f2: [ManuallyDrop<T>; 2],
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}
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2016-08-18 23:31:47 +08:00
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fn main() {}
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