error[E0382]: borrow of moved value: `bad_letters` --> $DIR/issue-61108.rs:6:5 | LL | let mut bad_letters = vec!['e', 't', 'o', 'i']; | --------------- move occurs because `bad_letters` has type `Vec`, which does not implement the `Copy` trait LL | for l in bad_letters { | ----------- `bad_letters` moved due to this implicit call to `.into_iter()` ... LL | bad_letters.push('s'); | ^^^^^^^^^^^ value borrowed here after move | note: `into_iter` takes ownership of the receiver `self`, which moves `bad_letters` --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL help: consider iterating over a slice of the `Vec`'s content to avoid moving into the `for` loop | LL | for l in &bad_letters { | + error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0382`.