error[E0382]: use of moved value: `hello` --> $DIR/not-copy-closure.rs:10:13 | LL | let b = hello; | ----- value moved here LL | let c = hello; | ^^^^^ value used here after move | note: closure cannot be moved more than once as it is not `Copy` due to moving the variable `a` out of its environment --> $DIR/not-copy-closure.rs:6:9 | LL | a += 1; | ^ help: consider mutably borrowing `hello` | LL | let b = &mut hello; | ++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0382`.