| error[E0038]: the trait `Foo` cannot be made into an object |
| --> $DIR/object-safety.rs:17:33 |
| | |
| LL | let i = Box::new(42_u32) as Box<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/object-safety.rs:7:22 |
| | |
| LL | trait Foo { |
| | --- this trait cannot be made into an object... |
| LL | fn baz(&self) -> impl Debug; |
| | ^^^^^^^^^^ ...because method `baz` references an `impl Trait` type in its return type |
| = help: consider moving `baz` to another trait |
| |
| error[E0038]: the trait `Foo` cannot be made into an object |
| --> $DIR/object-safety.rs:20:13 |
| | |
| LL | let s = i.baz(); |
| | ^^^^^^^ `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/object-safety.rs:7:22 |
| | |
| LL | trait Foo { |
| | --- this trait cannot be made into an object... |
| LL | fn baz(&self) -> impl Debug; |
| | ^^^^^^^^^^ ...because method `baz` references an `impl Trait` type in its return type |
| = help: consider moving `baz` to another trait |
| |
| error[E0038]: the trait `Foo` cannot be made into an object |
| --> $DIR/object-safety.rs:17:13 |
| | |
| LL | let i = Box::new(42_u32) as Box<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/object-safety.rs:7:22 |
| | |
| LL | trait Foo { |
| | --- this trait cannot be made into an object... |
| LL | fn baz(&self) -> impl Debug; |
| | ^^^^^^^^^^ ...because method `baz` references an `impl Trait` type in its return type |
| = help: consider moving `baz` to another trait |
| = note: required for the cast from `Box<u32>` to `Box<dyn Foo>` |
| |
| error: aborting due to 3 previous errors |
| |
| For more information about this error, try `rustc --explain E0038`. |