error[E0499]: cannot borrow `list.0.value` as mutable more than once at a time --> $DIR/assignment-to-differing-field.rs:20:21 | LL | fn assignment_to_field_projection<'a, T>( | -- lifetime `'a` defined here ... LL | result.push(&mut (list.0).value); | ^^^^^^^^^^^^^^^^^^^ `list.0.value` was mutably borrowed here in the previous iteration of the loop ... LL | return result; | ------ returning this value requires that `list.0.value` is borrowed for `'a` error[E0499]: cannot borrow `list.0.next` as mutable more than once at a time --> $DIR/assignment-to-differing-field.rs:23:26 | LL | fn assignment_to_field_projection<'a, T>( | -- lifetime `'a` defined here ... LL | if let Some(n) = (list.0).next.as_mut() { | ^^^^^^^^^^^^^--------- | | | `list.0.next` was mutably borrowed here in the previous iteration of the loop | argument requires that `list.0.next` is borrowed for `'a` error[E0499]: cannot borrow `list.0.0.0.0.0.value` as mutable more than once at a time --> $DIR/assignment-to-differing-field.rs:37:21 | LL | fn assignment_through_projection_chain<'a, T>( | -- lifetime `'a` defined here ... LL | result.push(&mut ((((list.0).0).0).0).0.value); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `list.0.0.0.0.0.value` was mutably borrowed here in the previous iteration of the loop ... LL | return result; | ------ returning this value requires that `list.0.0.0.0.0.value` is borrowed for `'a` error[E0499]: cannot borrow `list.0.0.0.0.0.next` as mutable more than once at a time --> $DIR/assignment-to-differing-field.rs:40:26 | LL | fn assignment_through_projection_chain<'a, T>( | -- lifetime `'a` defined here ... LL | if let Some(n) = ((((list.0).0).0).0).0.next.as_mut() { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^--------- | | | `list.0.0.0.0.0.next` was mutably borrowed here in the previous iteration of the loop | argument requires that `list.0.0.0.0.0.next` is borrowed for `'a` error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0499`.