error: Matching on `Some` with `ok()` is redundant
  --> $DIR/ok_if_let.rs:7:5
   |
7  | /     if let Some(y) = x.parse().ok() {
8  | |         y
9  | |     } else {
10 | |         0
11 | |     }
   | |_____^
   |
   = note: `-D if-let-some-result` implied by `-D warnings`
   = help: Consider matching on `Ok(y)` and removing the call to `ok` instead