error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable --> $DIR/many-mutable-borrows.rs:2:9 | LL | let v = Vec::new(); | ^ not mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable LL | v.push(0); | - cannot borrow as mutable | = note: ...and 5 other attempted mutable borrows help: consider changing this to be mutable | LL | let mut v = Vec::new(); | +++ error: aborting due to previous error For more information about this error, try `rustc --explain E0596`.