error[E0282]: type annotations needed for `*const _`
  --> $DIR/edition-raw-pointer-method-2018.rs:8:9
   |
LL |     let y = &x as *const _;
   |         ^
LL |
LL |     let _ = y.is_null();
   |               ------- cannot call a method on a raw pointer with an unknown pointee type
   |
help: consider giving `y` an explicit type, where the placeholders `_` are specified
   |
LL |     let y: *const _ = &x as *const _;
   |          ++++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0282`.