How to use slint::platform::set_platform with all built-in backend disabled?

[ultimaweapon]

I was tried to build Slint without any backend like the following:

[dependencies.slint]
version = "=1.8.0"
features = ["compat-1-2", "raw-window-handle-06", "std"]
default-features = false

The above configurations cause softbuffer crate fails to build somehow:

error[E0392]: type parameter `D` is never used
  --> /home/ultimaweapon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/softbuffer-0.4.6/src/lib.rs:75:20
   |
75 | pub struct Surface<D, W> {
   |                    ^ unused type parameter
76 |     /// This is boxed so that `Surface` is the same size on every platform.
77 |     surface_impl: Box<SurfaceDispatch<D, W>>,
   |                                       - `D` is named here, but is likely unused in the containing type
   |
   = help: consider removing `D`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `D` to be a const parameter, use `const D: /* Type */` instead

error[E0392]: type parameter `W` is never used
  --> /home/ultimaweapon/.cargo/registry/src/index.crates.io-6f17d22bba15001f/softbuffer-0.4.6/src/lib.rs:75:23
   |
75 | pub struct Surface<D, W> {
   |                       ^ unused type parameter
76 |     /// This is boxed so that `Surface` is the same size on every platform.
77 |     surface_impl: Box<SurfaceDispatch<D, W>>,
   |                                          - `W` is named here, but is likely unused in the containing type
   |
   = help: consider removing `W`, referring to it in a field, or using a marker such as `PhantomData`
   = help: if you intended `W` to be a const parameter, use `const W: /* Type */` instead

What I want to achieve is using winit together with Slint so I'm thinking to provide a custom Platform implementation.

[ogoffart]

The error is in the softbuffer
Do you know which crate is bringing softbuffer? With these features, Slint doesn't depend on it and i cannot reproduce that error.
Maybe you need to enable some feature of softbuffer.

[ultimaweapon]

Found out this error actually came from i-slint-renderer-skia, not slint. Enable either wayland or x11 on its fixes the issue.