error[E0204]: the trait `Copy` may not be implemented for this type --> $DIR/E0204.rs:5:15 | LL | foo: Vec, | ------------- this field does not implement `Copy` ... LL | impl Copy for Foo { } | ^^^ error[E0204]: the trait `Copy` may not be implemented for this type --> $DIR/E0204.rs:7:10 | LL | #[derive(Copy)] | ^^^^ LL | struct Foo2<'a> { LL | ty: &'a mut bool, | ---------------- this field does not implement `Copy` | = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0204]: the trait `Copy` may not be implemented for this type --> $DIR/E0204.rs:17:15 | LL | Bar { x: Vec }, | ----------- this field does not implement `Copy` ... LL | impl Copy for EFoo { } | ^^^^ error[E0204]: the trait `Copy` may not be implemented for this type --> $DIR/E0204.rs:19:10 | LL | #[derive(Copy)] | ^^^^ LL | enum EFoo2<'a> { LL | Bar(&'a mut bool), | ------------ this field does not implement `Copy` | = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0204`.