Runtime error when using flips

Hello!

With the latest Rust 1.68, whenever I use Flips, it crashes at runtime. I simply have to add this line in my code:
```rust
use flips;
```

And the app crashes first thing.

The crash point is a bit cryptic though:


The callstack seems to point out to a GDK issue:


But my app works well until I simply add `use flips;` to my code (and just this line).

I'm fairly new to Rust, so it's I still don't understand everything. That said, this package not having been updated for 3 years is a good candidate as to why it doesn't work with the latest Rust compiler/runtime...

What do you think?