error[E0508]: cannot move out of type `[S2; 1]`, a non-copy array
  --> $DIR/move-error-in-promoted.rs:5:16
   |
LL |     let _ = S1(C[0]).clone();
   |                ^^^^
   |                |
   |                cannot move out of here
   |                move occurs because value has type `S2`, which does not implement the `Copy` trait
   |
help: consider cloning the value if the performance cost is acceptable
   |
LL |     let _ = S1(C[0].clone()).clone();
   |                    ++++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0508`.