Am I missing something?

I've got a module for testing:
```rust
#[cfg(any(test, doctest))]
pub mod mock_flash;
```

And this works great for running tests.
But my doc test just isn't able to pick it up with this:

```rust
//! Basic API:
//!
//! ```rust
//! # use sequential_storage::map::{store_item, fetch_item, StorageItem, StorageItemError};
//! # use sequential_storage::mock_flash::MockFlashBase;
//! # type Flash = MockFlashBase<10, 1, 4096>;
//! ....
```