| #![feature(untagged_unions)] |
| |
| use std::mem::ManuallyDrop; |
| |
| #[derive(Clone)] //~ ERROR the trait bound `U1: std::marker::Copy` is not satisfied |
| union U1 { |
| a: u8, |
| } |
| |
| #[derive(Clone)] |
| union U2 { |
| a: u8, // OK |
| } |
| |
| impl Copy for U2 {} |
| |
| #[derive(Clone, Copy)] |
| union U3 { |
| a: u8, // OK |
| } |
| |
| #[derive(Clone, Copy)] |
| union U4<T: Copy> { |
| a: T, // OK |
| } |
| |
| #[derive(Clone, Copy)] |
| union U5<T> { |
| a: ManuallyDrop<T>, // OK |
| } |
| |
| #[derive(Clone)] |
| struct CloneNoCopy; |
| |
| fn main() { |
| let u = U5 { a: ManuallyDrop::new(CloneNoCopy) }; |
| let w = u.clone(); //~ ERROR no method named `clone` found for type `U5<CloneNoCopy>` |
| } |