error[E0502]: cannot borrow `u` (via `u.y`) as immutable because it is also borrowed as mutable (via `u.x`) --> $DIR/union-borrow-move-parent-sibling.rs:56:13 | LL | let a = &mut (*u.x).0; | --- mutable borrow occurs here (via `u.x`) LL | let b = &u.y; | ^^^^ immutable borrow of `u.y` -- which overlaps with `u.x` -- occurs here LL | use_borrow(a); | - mutable borrow later used here | = note: `u.y` is a field of the union `U`, so it overlaps the field `u.x` error[E0507]: cannot move out of dereference of `ManuallyDrop<((MockVec, MockVec), MockVec)>` --> $DIR/union-borrow-move-parent-sibling.rs:62:13 | LL | let a = u.x.0; | ^^^^^ move occurs because value has type `(MockVec, MockVec)`, which does not implement the `Copy` trait | help: consider borrowing here | LL | let a = &u.x.0; | + error[E0382]: use of moved value: `u` --> $DIR/union-borrow-move-parent-sibling.rs:64:13 | LL | let u = U { x: ManuallyDrop::new(((MockVec::new(), MockVec::new()), MockVec::new())) }; | - move occurs because `u` has type `U`, which does not implement the `Copy` trait LL | let a = u.x.0; LL | let a = u.x; | --- value moved here LL | let b = u.y; | ^^^ value used here after move error[E0502]: cannot borrow `u` (via `u.y`) as immutable because it is also borrowed as mutable (via `u.x`) --> $DIR/union-borrow-move-parent-sibling.rs:70:13 | LL | let a = &mut ((*u.x).0).0; | --- mutable borrow occurs here (via `u.x`) LL | let b = &u.y; | ^^^^ immutable borrow of `u.y` -- which overlaps with `u.x` -- occurs here LL | use_borrow(a); | - mutable borrow later used here | = note: `u.y` is a field of the union `U`, so it overlaps the field `u.x` error[E0507]: cannot move out of dereference of `ManuallyDrop<((MockVec, MockVec), MockVec)>` --> $DIR/union-borrow-move-parent-sibling.rs:76:13 | LL | let a = (u.x.0).0; | ^^^^^^^^^ move occurs because value has type `MockVec`, which does not implement the `Copy` trait | help: consider borrowing here | LL | let a = &(u.x.0).0; | + error[E0382]: use of moved value: `u` --> $DIR/union-borrow-move-parent-sibling.rs:78:13 | LL | let u = U { x: ManuallyDrop::new(((MockVec::new(), MockVec::new()), MockVec::new())) }; | - move occurs because `u` has type `U`, which does not implement the `Copy` trait LL | let a = (u.x.0).0; LL | let a = u.x; | --- value moved here LL | let b = u.y; | ^^^ value used here after move error[E0502]: cannot borrow `u` (via `u.x`) as immutable because it is also borrowed as mutable (via `u.y`) --> $DIR/union-borrow-move-parent-sibling.rs:84:13 | LL | let a = &mut *u.y; | --- mutable borrow occurs here (via `u.y`) LL | let b = &u.x; | ^^^^ immutable borrow of `u.x` -- which overlaps with `u.y` -- occurs here LL | use_borrow(a); | - mutable borrow later used here | = note: `u.x` is a field of the union `U`, so it overlaps the field `u.y` error: aborting due to 7 previous errors Some errors have detailed explanations: E0382, E0502, E0507. For more information about an error, try `rustc --explain E0382`.