error[E0716]: temporary value dropped while borrowed --> $DIR/borrowck-borrowed-uniq-rvalue.rs:8:28 | LL | buggy_map.insert(42, &*Box::new(1)); | ^^^^^^^^^^^ - temporary value is freed at the end of this statement | | | creates a temporary value which is freed while still in use ... LL | buggy_map.insert(43, &*tmp); | --------------------------- borrow later used here | help: consider using a `let` binding to create a longer lived value | LL ~ let binding = Box::new(1); LL ~ buggy_map.insert(42, &*binding); | error: aborting due to previous error For more information about this error, try `rustc --explain E0716`.