error: this loop could be written as a `for` loop --> $DIR/issue_2356.rs:15:9 | LL | while let Some(e) = it.next() { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `for e in it` | note: the lint level is defined here --> $DIR/issue_2356.rs:1:9 | LL | #![deny(clippy::while_let_on_iterator)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to previous error