error[E0605]: non-primitive cast: `&&[i32; 1]` as `&[_]`
  --> $DIR/issue-73886.rs:2:13
   |
LL |     let _ = &&[0] as &[_];
   |             ^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object

error[E0605]: non-primitive cast: `u32` as `Option<_>`
  --> $DIR/issue-73886.rs:4:13
   |
LL |     let _ = 7u32 as Option<_>;
   |             ^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0605`.