error[E0599]: no method named `as_ref` found for type `u8` in the current scope
  --> $DIR/issue-89806.rs:2:9
   |
LL |     0u8.as_ref();
   |         ^^^^^^ method not found in `u8`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0599`.