| error[E0038]: the trait `Foo` cannot be made into an object |
| --> $DIR/arbitrary-self-types-not-object-safe.rs:33:32 |
| | |
| LL | fn foo(self: &Rc<Self>) -> usize; |
| | --------- help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self` |
| ... |
| LL | let x = Rc::new(5usize) as Rc<dyn Foo>; |
| | ^^^^^^^^^^^ `Foo` 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/arbitrary-self-types-not-object-safe.rs:8:18 |
| | |
| LL | trait Foo { |
| | --- this trait cannot be made into an object... |
| LL | fn foo(self: &Rc<Self>) -> usize; |
| | ^^^^^^^^^ ...because method `foo`'s `self` parameter cannot be dispatched on |
| = help: only type `usize` implements the trait, consider using it directly instead |
| |
| error[E0038]: the trait `Foo` cannot be made into an object |
| --> $DIR/arbitrary-self-types-not-object-safe.rs:33:13 |
| | |
| LL | fn foo(self: &Rc<Self>) -> usize; |
| | --------- help: consider changing method `foo`'s `self` parameter to be `&self`: `&Self` |
| ... |
| LL | let x = Rc::new(5usize) as Rc<dyn Foo>; |
| | ^^^^^^^^^^^^^^^ `Foo` 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/arbitrary-self-types-not-object-safe.rs:8:18 |
| | |
| LL | trait Foo { |
| | --- this trait cannot be made into an object... |
| LL | fn foo(self: &Rc<Self>) -> usize; |
| | ^^^^^^^^^ ...because method `foo`'s `self` parameter cannot be dispatched on |
| = help: only type `usize` implements the trait, consider using it directly instead |
| = note: required for the cast from `Rc<usize>` to `Rc<dyn Foo>` |
| |
| error: aborting due to 2 previous errors |
| |
| For more information about this error, try `rustc --explain E0038`. |