Rust has GTK and qtquick bindings, and there is also https://github.com/pistondevelopers/conrod https://github.com/pistondevelopers/conrod which also uses immed

Rust has GTK and qtquick bindings, and there is also https://github.com/pistondevelopers/conrod https://github.com/pistondevelopers/conrod which also uses immediate mode. Nuklear looks like it's more capable right now than conrod, though, so Rust bindings could still be good to have.