1error[E0599]: the method `clone` exists for struct `Box<dyn Foo>`, but its trait bounds were not satisfied
2  --> $DIR/unique-object-noncopyable.rs:24:16
3   |
4LL |   trait Foo {
5   |   ---------
6   |   |
7   |   doesn't satisfy `dyn Foo: Clone`
8   |   doesn't satisfy `dyn Foo: Sized`
9...
10LL |       let _z = y.clone();
11   |                  ^^^^^ method cannot be called on `Box<dyn Foo>` due to unsatisfied trait bounds
12   |
13  ::: $SRC_DIR/alloc/src/boxed.rs:LL:COL
14   |
15LL | / pub struct Box<
16LL | |     T: ?Sized,
17LL | |     #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator = Global,
18LL | | >(Unique<T>, A);
19   | |________________- doesn't satisfy `Box<dyn Foo>: Clone`
20   |
21   = note: the following trait bounds were not satisfied:
22           `dyn Foo: Sized`
23           which is required by `Box<dyn Foo>: Clone`
24           `dyn Foo: Clone`
25           which is required by `Box<dyn Foo>: Clone`
26
27error: aborting due to previous error
28
29For more information about this error, try `rustc --explain E0599`.
30