| error[E0107]: missing generics for associated type `SuperTrait::SubType` |
| --> $DIR/issue-76535.rs:39:33 |
| | |
| LL | let sub: Box<dyn SuperTrait<SubType = SubStruct>> = Box::new(SuperStruct::new(0)); |
| | ^^^^^^^ expected 1 lifetime argument |
| | |
| note: associated type defined here, with 1 lifetime parameter: `'a` |
| --> $DIR/issue-76535.rs:9:10 |
| | |
| LL | type SubType<'a>: SubTrait where Self: 'a; |
| | ^^^^^^^ -- |
| help: add missing lifetime argument |
| | |
| LL | let sub: Box<dyn SuperTrait<SubType<'a> = SubStruct>> = Box::new(SuperStruct::new(0)); |
| | ++++ |
| |
| error[E0038]: the trait `SuperTrait` cannot be made into an object |
| --> $DIR/issue-76535.rs:39:14 |
| | |
| LL | let sub: Box<dyn SuperTrait<SubType = SubStruct>> = Box::new(SuperStruct::new(0)); |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `SuperTrait` 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/issue-76535.rs:9:10 |
| | |
| LL | pub trait SuperTrait { |
| | ---------- this trait cannot be made into an object... |
| LL | type SubType<'a>: SubTrait where Self: 'a; |
| | ^^^^^^^ ...because it contains the generic associated type `SubType` |
| = help: consider moving `SubType` to another trait |
| = help: only type `SuperStruct` is seen to implement the trait in this crate, consider using it directly instead |
| = note: `SuperTrait` can be implemented in other crates; if you want to support your users passing their own types here, you can't refer to a specific type |
| |
| error[E0038]: the trait `SuperTrait` cannot be made into an object |
| --> $DIR/issue-76535.rs:39:57 |
| | |
| LL | let sub: Box<dyn SuperTrait<SubType = SubStruct>> = Box::new(SuperStruct::new(0)); |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `SuperTrait` 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/issue-76535.rs:9:10 |
| | |
| LL | pub trait SuperTrait { |
| | ---------- this trait cannot be made into an object... |
| LL | type SubType<'a>: SubTrait where Self: 'a; |
| | ^^^^^^^ ...because it contains the generic associated type `SubType` |
| = help: consider moving `SubType` to another trait |
| = help: only type `SuperStruct` is seen to implement the trait in this crate, consider using it directly instead |
| = note: `SuperTrait` can be implemented in other crates; if you want to support your users passing their own types here, you can't refer to a specific type |
| = note: required for the cast from `Box<SuperStruct>` to `Box<dyn SuperTrait<SubType = SubStruct<'_>>>` |
| |
| error: aborting due to 3 previous errors |
| |
| Some errors have detailed explanations: E0038, E0107. |
| For more information about an error, try `rustc --explain E0038`. |