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Panic at src/render_window.rs:82:14

When running cargo run --release on an M1 Apple Silicon Macbook, I get

     Running `target/release/clam5`
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/render_window.rs:82:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

This part of the code is

  71   │     async fn new(window: &Window) -> Self {
  72   │         let size = window.inner_size();
  73   │ 
  74   │         let instance = wgpu::Instance::new(wgpu::BackendBit::VULKAN);
  75   │         let surface = unsafe { instance.create_surface(window) };
  76   │         let adapter = instance
  77   │             .request_adapter(&wgpu::RequestAdapterOptions {
  78   │                 power_preference: wgpu::PowerPreference::Default,
  79   │                 compatible_surface: Some(&surface),
  80   │             })
  81   │             .await
  82   │             .unwrap();

I got suspicious because of BackendBit::VULKAN, and its docs mention that it's supported on macOS with the vulkan-portability feature. I added that to the wgpu line in Cargo.toml:

-wgpu = ""
+wgpu = { version = "", features = ["vulkan-portability"] }

and reran to get a different error:

     Running `target/release/clam5`
[2021-01-18T00:00:24Z INFO  gfx_backend_vulkan] Missing Vulkan entry points: LoadingError(DlOpen { desc: "dlopen(libvulkan.dylib, 2): image not found" })
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/render_window.rs:82:14

Then I tried just switching to BackendBit::PRIMARY to see whether it would run anyways, and got an error about a missing font. I don't have the named font for macOS, so I added "/Library/Fonts/Arial Unicode.ttf" and after that it (seemed to) run successfully.