error: handle written amount returned or use `Write::write_all` instead
  --> $DIR/unused_io_amount.rs:7:5
   |
LL |     s.write(b"test")?;
   |     ^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::unused-io-amount` implied by `-D warnings`

error: handle read amount returned or use `Read::read_exact` instead
  --> $DIR/unused_io_amount.rs:9:5
   |
LL |     s.read(&mut buf)?;
   |     ^^^^^^^^^^^^^^^^^

error: handle written amount returned or use `Write::write_all` instead
  --> $DIR/unused_io_amount.rs:14:5
   |
LL |     s.write(b"test").unwrap();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^

error: handle read amount returned or use `Read::read_exact` instead
  --> $DIR/unused_io_amount.rs:16:5
   |
LL |     s.read(&mut buf).unwrap();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 4 previous errors