src/test/ui/generic-associated-types/issue-78671.stderr

   1 error[E0107]: missing generics for associated type `CollectionFamily::Member`
   2   --> $DIR/issue-78671.rs:8:47
   3    |
   4 LL |     Box::new(Family) as &dyn CollectionFamily<Member=usize>
   5    |                                               ^^^^^^ expected 1 generic argument
   6    |
   7 note: associated type defined here, with 1 generic parameter: `T`
   8   --> $DIR/issue-78671.rs:5:10
   9    |
  10 LL |     type Member<T>;
  11    |          ^^^^^^ -
  12 help: add missing generic argument
  13    |
  14 LL |     Box::new(Family) as &dyn CollectionFamily<Member<T>=usize>
  15    |                                               ^^^^^^^^^
  16
  17 error[E0038]: the trait `CollectionFamily` cannot be made into an object
  18   --> $DIR/issue-78671.rs:8:25
  19    |
  20 LL |     Box::new(Family) as &dyn CollectionFamily<Member=usize>
  21    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `CollectionFamily` cannot be made into an object
  22    |
  23    = help: consider moving `Member` to another trait
  24 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>
  25   --> $DIR/issue-78671.rs:5:10
  26    |
  27 LL | trait CollectionFamily {
  28    |       ---------------- this trait cannot be made into an object...
  29 LL |     type Member<T>;
  30    |          ^^^^^^ ...because it contains the generic associated type `Member`
  31
  32 error: aborting due to 2 previous errors
  33
  34 Some errors have detailed explanations: E0038, E0107.
  35 For more information about an error, try `rustc --explain E0038`.