struct Surface {}
struct Adapter { info: String }

struct BackendState {
    surface: Box<Surface>,
    adapters: Vec<Adapter>,
}

#[derive(Default)]
struct RendererState {
    backend: Option<BackendState>,
}

impl RendererState {
    fn new() -> Self {
        let mut ret: RendererState = Default::default();

        ret.create_backend();

        ret
    }

    fn create_backend(&mut self) {
        let adapters = self.backend.as_mut().unwrap();
        let surface = adapters.surface;
        let adapters = adapters.adapters;

        for adapter in adapters {
            println!("{}", adapter.info);
        }

        let adapter = adapters.remove(0);
        /* Do stuff with adapter */
    }
}

fn main() {
    let r = RendererState::new();
}