error: this loop could be written as a `for` loop --> $DIR/issue_2356.rs:17:29 | 17 | while let Some(e) = it.next() { | ^^^^^^^^^ help: try: `for e in it { .. }` | note: lint level defined here --> $DIR/issue_2356.rs:3:9 | 3 | #![deny(clippy::while_let_on_iterator)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error