Missed a blank line, which causes the prompt incorrect like below:
```rust
You can keep working on this exercise,
or jump into the next one by removing the `I AM NOT DONE` comment:
6 | // Make this code compile by using the proper Rc primitives to express that the sun has multiple owners.
7 |
8 | // I AM NOT DONE
9 | use std::rc::Rc;
```
