rust-clippy/tests/ui/expect.stderr

error: used `expect()` on `an Option` value. If this value is an `None` it will panic
  --> $DIR/expect.rs:5:13
   |
LL |     let _ = opt.expect("");
   |             ^^^^^^^^^^^^^^
   |
   = note: `-D clippy::option-expect-used` implied by `-D warnings`

error: used `expect()` on `a Result` value. If this value is an `Err` it will panic
  --> $DIR/expect.rs:10:13
   |
LL |     let _ = res.expect("");
   |             ^^^^^^^^^^^^^^
   |
   = note: `-D clippy::result-expect-used` implied by `-D warnings`

error: aborting due to 2 previous errors