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

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

error: used `unwrap_err()` on a `Result` value
  --> $DIR/unwrap.rs:14:13
   |
LL |     let _ = res.unwrap_err();
   |             ^^^^^^^^^^^^^^^^
   |
   = note: if this value is an `Ok`, it will panic
   = help: consider using `expect_err()` to provide a better panic message

error: aborting due to 3 previous errors