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