error[E0277]: the trait bound `U1: Copy` is not satisfied --> $DIR/union-derive-clone.rs:6:10 | LL | #[derive(Clone)] | ^^^^^ the trait `Copy` is not implemented for `U1` | note: required by a bound in `AssertParamIsCopy` --> $SRC_DIR/core/src/clone.rs:LL:COL = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider annotating `U1` with `#[derive(Copy)]` | LL + #[derive(Copy)] LL | union U1 { | error[E0599]: the method `clone` exists for union `U5`, but its trait bounds were not satisfied --> $DIR/union-derive-clone.rs:38:15 | LL | union U5 { | ----------- | | | method `clone` not found for this union | doesn't satisfy `U5: Clone` ... LL | struct CloneNoCopy; | ------------------ doesn't satisfy `CloneNoCopy: Copy` ... LL | let w = u.clone(); | ^^^^^ method cannot be called on `U5` due to unsatisfied trait bounds | note: trait bound `CloneNoCopy: Copy` was not satisfied --> $DIR/union-derive-clone.rs:28:10 | LL | #[derive(Clone, Copy)] | ^^^^^ unsatisfied trait bound introduced in this `derive` macro help: consider annotating `CloneNoCopy` with `#[derive(Clone, Copy)]` | LL + #[derive(Clone, Copy)] LL | struct CloneNoCopy; | error: aborting due to 2 previous errors Some errors have detailed explanations: E0277, E0599. For more information about an error, try `rustc --explain E0277`.