| error[E0107]: missing generics for associated type `MapLike::VRefCont` |
| --> $DIR/issue-79422.rs:47:36 |
| | |
| LL | as Box<dyn MapLike<u8, u8, VRefCont = dyn RefCont<'_, u8>>>; |
| | ^^^^^^^^ expected 1 lifetime argument |
| | |
| note: associated type defined here, with 1 lifetime parameter: `'a` |
| --> $DIR/issue-79422.rs:23:10 |
| | |
| LL | type VRefCont<'a>: RefCont<'a, V> where Self: 'a; |
| | ^^^^^^^^ -- |
| help: add missing lifetime argument |
| | |
| LL | as Box<dyn MapLike<u8, u8, VRefCont<'a> = dyn RefCont<'_, u8>>>; |
| | ++++ |
| |
| error[E0038]: the trait `MapLike` cannot be made into an object |
| --> $DIR/issue-79422.rs:47:12 |
| | |
| LL | as Box<dyn MapLike<u8, u8, VRefCont = dyn RefCont<'_, u8>>>; |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `MapLike` 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-79422.rs:23:10 |
| | |
| LL | trait MapLike<K, V> { |
| | ------- this trait cannot be made into an object... |
| LL | type VRefCont<'a>: RefCont<'a, V> where Self: 'a; |
| | ^^^^^^^^ ...because it contains the generic associated type `VRefCont` |
| = help: consider moving `VRefCont` to another trait |
| = help: the following types implement the trait, consider defining an enum where each variant holds one of these types, implementing `MapLike` for this new enum and using it instead: |
| std::collections::BTreeMap<K, V> |
| Source |
| |
| error[E0038]: the trait `MapLike` cannot be made into an object |
| --> $DIR/issue-79422.rs:44:13 |
| | |
| LL | let m = Box::new(std::collections::BTreeMap::<u8, u8>::new()) |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `MapLike` 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-79422.rs:23:10 |
| | |
| LL | trait MapLike<K, V> { |
| | ------- this trait cannot be made into an object... |
| LL | type VRefCont<'a>: RefCont<'a, V> where Self: 'a; |
| | ^^^^^^^^ ...because it contains the generic associated type `VRefCont` |
| = help: consider moving `VRefCont` to another trait |
| = help: the following types implement the trait, consider defining an enum where each variant holds one of these types, implementing `MapLike` for this new enum and using it instead: |
| std::collections::BTreeMap<K, V> |
| Source |
| = note: required for the cast from `Box<BTreeMap<u8, u8>>` to `Box<dyn MapLike<u8, u8, VRefCont = (dyn RefCont<'_, u8> + 'static)>>` |
| |
| error: aborting due to 3 previous errors |
| |
| Some errors have detailed explanations: E0038, E0107. |
| For more information about an error, try `rustc --explain E0038`. |