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

error: aborting due to previous error

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