error: casting a character literal to `u8` truncates
  --> $DIR/char_lit_as_u8.rs:4:13
   |
LL |     let _ = '❤' as u8; // no suggestion, since a byte literal won't work.
   |             ^^^^^^^^^
   |
   = note: `-D clippy::char-lit-as-u8` implied by `-D warnings`
   = note: `char` is four bytes wide, but `u8` is a single byte

error: aborting due to previous error