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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 "dyn-compatible" 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 "dyn-compatible" 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`.
|
