As a Rust user, very happy with qmetaobject-rs. It was really a breeze to make a basic GUI for personal use ...
I would also add an opinion: Qt is a great fit for Rust. GUI toolkits (=presentation layer) is best done declaratively and QML does an amazing job at it. Keep in mind that making a GUI kit, specially for 5 platforms in a way that it runs and feels uniformly across them all is a herculean task that returns no benefits because even if I can write some GUI in a "rusty" way, it won't suddenly speed up things because GUI is almost never a bottleneck.
I would also add an opinion: Qt is a great fit for Rust. GUI toolkits (=presentation layer) is best done declaratively and QML does an amazing job at it. Keep in mind that making a GUI kit, specially for 5 platforms in a way that it runs and feels uniformly across them all is a herculean task that returns no benefits because even if I can write some GUI in a "rusty" way, it won't suddenly speed up things because GUI is almost never a bottleneck.