error[E0038]: the trait `Trait` cannot be made into an object
  --> $DIR/object-unsafe-trait-references-self.rs:9:12
   |
LL | fn bar(x: &dyn Trait) {}
   |            ^^^^^^^^^ `Trait` cannot be made into an object
   |
note: for a trait to be "object safe" 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/object-unsafe-trait-references-self.rs:2:22
   |
LL | trait Trait {
   |       ----- this trait cannot be made into an object...
LL |     fn baz(&self, _: Self) {}
   |                      ^^^^ ...because method `baz` references the `Self` type in this parameter
LL |
LL |     fn bat(&self) -> Self {}
   |                      ^^^^ ...because method `bat` references the `Self` type in its return type
   = help: consider moving `baz` to another trait
   = help: consider moving `bat` to another trait

error[E0038]: the trait `Other` cannot be made into an object
  --> $DIR/object-unsafe-trait-references-self.rs:13:12
   |
LL | fn foo(x: &dyn Other) {}
   |            ^^^^^^^^^ `Other` cannot be made into an object
   |
note: for a trait to be "object safe" 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/object-unsafe-trait-references-self.rs:11:14
   |
LL | trait Other: Sized {}
   |       -----  ^^^^^ ...because it requires `Self: Sized`
   |       |
   |       this trait cannot be made into an object...

error[E0277]: the size for values of type `Self` cannot be known at compilation time
  --> $DIR/object-unsafe-trait-references-self.rs:2:19
   |
LL |     fn baz(&self, _: Self) {}
   |                   ^ doesn't have a size known at compile-time
   |
   = help: unsized fn params are gated as an unstable feature
help: consider further restricting `Self`
   |
LL |     fn baz(&self, _: Self) where Self: Sized {}
   |                            +++++++++++++++++
help: function arguments must have a statically known size, borrowed types always have a known size
   |
LL |     fn baz(&self, _: &Self) {}
   |                      +

error[E0308]: mismatched types
  --> $DIR/object-unsafe-trait-references-self.rs:4:27
   |
LL | trait Trait {
   | ----------- expected this type parameter
...
LL |     fn bat(&self) -> Self {}
   |                           ^^ expected type parameter `Self`, found `()`
   |
   = note: expected type parameter `Self`
                   found unit type `()`

error[E0277]: the size for values of type `Self` cannot be known at compilation time
  --> $DIR/object-unsafe-trait-references-self.rs:4:22
   |
LL |     fn bat(&self) -> Self {}
   |                      ^^^^ doesn't have a size known at compile-time
   |
   = note: the return type of a function must have a statically known size
help: consider further restricting `Self`
   |
LL |     fn bat(&self) -> Self where Self: Sized {}
   |                           +++++++++++++++++

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0038, E0277, E0308.
For more information about an error, try `rustc --explain E0038`.