error[E0107]: wrong number of type arguments: expected 2, found 4
  --> $DIR/use-type-argument-instead-of-assoc-type.rs:7:32
   |
LL |     i: Box<dyn T<usize, usize, usize, usize, B=usize>>,
   |                                ^^^^^  ^^^^^ unexpected type argument
   |                                |
   |                                unexpected type argument

error[E0191]: the value of the associated types `A` (from the trait `T`), `C` (from the trait `T`) must be specified
  --> $DIR/use-type-argument-instead-of-assoc-type.rs:7:12
   |
LL |     type A;
   |     ------- `A` defined here
LL |     type B;
LL |     type C;
   |     ------- `C` defined here
...
LL |     i: Box<dyn T<usize, usize, usize, usize, B=usize>>,
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |            |
   |            associated type `A` must be specified
   |            associated type `C` must be specified
help: if you meant to specify the associated types, write
   |
LL |     i: Box<dyn T<usize, usize, A = usize, C = usize, B=usize>>,
   |                                ^^^^^^^^^  ^^^^^^^^^

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0107, E0191.
For more information about an error, try `rustc --explain E0107`.