error[E0499]: cannot borrow `w.p.x` as mutable more than once at a time --> $DIR/multilevel-path.rs:23:14 | LL | let mut c = || { | -- first mutable borrow occurs here LL | w.p.x += 20; | ----- first borrow occurs due to use of `w.p.x` in closure ... LL | let py = &mut w.p.x; | ^^^^^^^^^^ second mutable borrow occurs here LL | LL | c(); | - first borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0499`.