Problem with deriving FromValueRef

The following code:

```rust
#[derive(Clone, Debug, ForeignValue, FromValueRef, IntoValue)]
struct example {
    test: u64
}
```

Gives the error:
```
error[E0244]: wrong number of type arguments: expected 1, found 2
  --> <omitted>
   |
24 | #[derive(Clone, Debug, ForeignValue, FromValueRef, IntoValue)]
   |                  
```