error[E0505]: cannot move out of `a` because it is borrowed --> $DIR/borrow-for-loop-head.rs:4:18 | LL | for i in &a { | -- borrow of `a` occurs here LL | for j in a { | ^ move out of `a` occurs here error[E0382]: use of moved value: `a` --> $DIR/borrow-for-loop-head.rs:4:18 | LL | let a = vec![1, 2, 3]; | - move occurs because `a` has type `Vec`, which does not implement the `Copy` trait LL | for i in &a { LL | for j in a { | ^ | | | `a` moved due to this implicit call to `.into_iter()`, in previous iteration of loop | help: consider borrowing to avoid moving into the for loop: `&a` | note: this function takes ownership of the receiver `self`, which moves `a` --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL | LL | fn into_iter(self) -> Self::IntoIter; | ^^^^ error: aborting due to 2 previous errors Some errors have detailed explanations: E0382, E0505. For more information about an error, try `rustc --explain E0382`.