error[E0277]: the trait bound `T: Copy` is not satisfied
  --> $DIR/issue-43784-associated-type.rs:14:5
   |
LL |     type Assoc: Partial<Self>;
   |                 ------------- required by this bound in `Complete::Assoc`
...
LL |     type Assoc = T;
   |     ^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `T`
   |
help: consider restricting type parameter `T`
   |
LL | impl<T: std::marker::Copy> Complete for T {
   |       ^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.