error: used `expect()` on an `Option` value
  --> $DIR/expect.rs:6:13
   |
LL |     let _ = opt.expect("");
   |             ^^^^^^^^^^^^^^
   |
   = note: if this value is `None`, it will panic
   = note: `-D clippy::expect-used` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::expect_used)]`

error: used `expect()` on a `Result` value
  --> $DIR/expect.rs:12:13
   |
LL |     let _ = res.expect("");
   |             ^^^^^^^^^^^^^^
   |
   = note: if this value is an `Err`, it will panic

error: used `expect_err()` on a `Result` value
  --> $DIR/expect.rs:14:13
   |
LL |     let _ = res.expect_err("");
   |             ^^^^^^^^^^^^^^^^^^
   |
   = note: if this value is an `Ok`, it will panic

error: aborting due to 3 previous errors