error: used `unwrap()` on `an Option` value
  --> $DIR/unwrap.rs:5:13
   |
LL |     let _ = opt.unwrap();
   |             ^^^^^^^^^^^^
   |
   = help: if you don't want to handle the `None` case gracefully, consider using `expect()` to provide a better panic message
   = note: `-D clippy::unwrap-used` implied by `-D warnings`

error: used `unwrap()` on `a Result` value
  --> $DIR/unwrap.rs:10:13
   |
LL |     let _ = res.unwrap();
   |             ^^^^^^^^^^^^
   |
   = help: if you don't want to handle the `Err` case gracefully, consider using `expect()` to provide a better panic message

error: used `unwrap_err()` on `a Result` value
  --> $DIR/unwrap.rs:11:13
   |
LL |     let _ = res.unwrap_err();
   |             ^^^^^^^^^^^^^^^^
   |
   = help: if you don't want to handle the `Ok` case gracefully, consider using `expect_err()` to provide a better panic message

error: aborting due to 3 previous errors