```
error[E0507]: cannot move out of `*x` which is behind a shared reference
--> $DIR/borrowck-fn-in-const-a.rs:6:16
|
LL | return *x
| ^^ move occurs because `*x` has type `String`, which does not implement the `Copy` trait
|
help: consider cloning the value if the performance cost is acceptable
|
LL - return *x
LL + return x.clone()
|
```
Derive expansions for packed structs cause move errors because
they prefer copying over borrowing since borrowing the fields of a
packed struct can result in unaligned access and therefore undefined
behaviour.
This underlying cause of the errors, however, is not apparent
to the user. We add a diagnostic note here to remedy that.
