mirror of https://github.com/rust-lang/rust
29 lines
714 B
Rust
29 lines
714 B
Rust
#![allow(dead_code)]
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union U {
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a: u8, // OK
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}
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union W {
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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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b: String, // OK, only one field is reported
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}
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struct S(String);
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// `S` doesn't implement `Drop` trait, but still has non-trivial destructor
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union Y {
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a: S, //~ ERROR field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
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}
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// We don't know if `T` is trivially-destructable or not until trans
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union J<T> {
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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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}
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union H<T: Copy> {
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a: T, // OK, `T` is `Copy`, no destructor
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}
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fn main() {}
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