error[E0038]: the trait `Trait` cannot be made into an object
  --> $DIR/feature-gate-dispatch-from-dyn-missing-impl.rs:32:25
   |
LL |     fn ptr(self: Ptr<Self>);
   |                  --------- help: consider changing method `ptr`'s `self` parameter to be `&self`: `&Self`
...
LL |     Ptr(Box::new(4)) as Ptr<dyn Trait>;
   |                         ^^^^^^^^^^^^^^ `Trait` cannot be made into an object
   |
note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  --> $DIR/feature-gate-dispatch-from-dyn-missing-impl.rs:25:18
   |
LL | trait Trait {
   |       ----- this trait cannot be made into an object...
LL |     fn ptr(self: Ptr<Self>);
   |                  ^^^^^^^^^ ...because method `ptr`'s `self` parameter cannot be dispatched on
   = help: only type `i32` implements the trait, consider using it directly instead

error[E0038]: the trait `Trait` cannot be made into an object
  --> $DIR/feature-gate-dispatch-from-dyn-missing-impl.rs:32:5
   |
LL |     fn ptr(self: Ptr<Self>);
   |                  --------- help: consider changing method `ptr`'s `self` parameter to be `&self`: `&Self`
...
LL |     Ptr(Box::new(4)) as Ptr<dyn Trait>;
   |     ^^^^^^^^^^^^^^^^ `Trait` cannot be made into an object
   |
note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  --> $DIR/feature-gate-dispatch-from-dyn-missing-impl.rs:25:18
   |
LL | trait Trait {
   |       ----- this trait cannot be made into an object...
LL |     fn ptr(self: Ptr<Self>);
   |                  ^^^^^^^^^ ...because method `ptr`'s `self` parameter cannot be dispatched on
   = help: only type `i32` implements the trait, consider using it directly instead
   = note: required for the cast from `Ptr<{integer}>` to `Ptr<dyn Trait>`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0038`.