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error[E0107]: missing generics for associated type `CollectionFamily::Member`
--> $DIR/issue-78671.rs:11:47
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LL | Box::new(Family) as &dyn CollectionFamily<Member=usize>
| ^^^^^^ expected 1 generic argument
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note: associated type defined here, with 1 generic parameter: `T`
--> $DIR/issue-78671.rs:8:10
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LL | type Member<T>;
| ^^^^^^ -
help: add missing generic argument
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LL | Box::new(Family) as &dyn CollectionFamily<Member<T>=usize>
| ~~~~~~~~~
error[E0038]: the trait `CollectionFamily` cannot be made into an object
--> $DIR/issue-78671.rs:11:25
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LL | Box::new(Family) as &dyn CollectionFamily<Member=usize>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `CollectionFamily` 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>
--> $DIR/issue-78671.rs:8:10
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LL | trait CollectionFamily {
| ---------------- this trait cannot be made into an object...
LL | type Member<T>;
| ^^^^^^ ...because it contains the generic associated type `Member`
= help: consider moving `Member` to another trait
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0038, E0107.
For more information about an error, try `rustc --explain E0038`.
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