1 error[E0107]: missing generics for associated type `CollectionFamily::Member`
2 --> $DIR/issue-78671.rs:10:47
4 LL | Box::new(Family) as &dyn CollectionFamily<Member=usize>
5 | ^^^^^^ expected 1 generic argument
7 note: associated type defined here, with 1 generic parameter: `T`
8 --> $DIR/issue-78671.rs:7:10
12 help: add missing generic argument
14 LL | Box::new(Family) as &dyn CollectionFamily<Member<T>=usize>
17 error: aborting due to previous error
19 For more information about this error, try `rustc --explain E0107`.