error[E0503]: cannot use `x` because it was mutably borrowed --> $DIR/reference-carried-through-struct-field.rs:21:5 | LL | let wrapper = Wrap { w: &mut x }; | ------ borrow of `x` occurs here LL | x += 1; //[ast]~ ERROR cannot assign to `x` because it is borrowed [E0506] | ^^^^^^ use of borrowed `x` LL | //[mir]~^ ERROR cannot use `x` because it was mutably borrowed [E0503] LL | *wrapper.w += 1; | --------------- borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0503`.