error: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
  --> $DIR/char_lit_as_u8.rs:13:13
   |
LL |     let c = 'a' as u8;
   |             ^^^^^^^^^
   |
   = note: `-D clippy::char-lit-as-u8` implied by `-D warnings`
   = help: Consider using a byte literal instead:
           b'a'

error: aborting due to previous error