error[E0506]: cannot assign to `greeting` because it is borrowed --> $DIR/issue-58776-borrowck-scans-children.rs:5:5 | LL | let res = (|| (|| &greeting)())(); | -- -------- borrow occurs due to use in closure | | | borrow of `greeting` occurs here LL | LL | greeting = "DEALLOCATED".to_string(); | ^^^^^^^^ assignment to borrowed `greeting` occurs here ... LL | println!("thread result: {:?}", res); | --- borrow later used here error[E0505]: cannot move out of `greeting` because it is borrowed --> $DIR/issue-58776-borrowck-scans-children.rs:7:10 | LL | let res = (|| (|| &greeting)())(); | -- -------- borrow occurs due to use in closure | | | borrow of `greeting` occurs here ... LL | drop(greeting); | ^^^^^^^^ move out of `greeting` occurs here ... LL | println!("thread result: {:?}", res); | --- borrow later used here error: aborting due to 2 previous errors Some errors have detailed explanations: E0505, E0506. For more information about an error, try `rustc --explain E0505`.