Using an array as a slice causes a compiler error

まず、issue にある最小限の Rust 例をコンパイルし、&data を &[u32] パラメーターに渡す do_work 呼び出しに注目します。コンパイラーによる配列からスライスへの変換の処理を追跡し、compute shader のエントリーポイントを使って例が正常にコンパイルされることを確認します。

I'm surprised I haven't hit this earlier, but it's not possible to pass an array as a slice. Is this a known limitation? Is there an easy workaround?

Expected Behaviour

I would expect to be able to pass an array like [u32; 3] as a parameter to a function that takes a slice.

Example & Steps To Reproduce

Here is a minimal reproducible example:

#![no_std]
#![allow(unexpected_cfgs)]

fn do_work(data: &[u32], slab: &mut [u32]) {
    slab[0] = data[0];
    slab[1] = data[1];
    slab[2] = data[2];
}

#[spirv(compute(threads(16)))]
pub fn compute_shader(
    #[spirv(storage_buffer, descriptor_set = 0, binding = 0)] slab: &mut [u32],
    #[spirv(global_invocation_id)] global_id: glam::UVec3,
) {
    let data = [global_id.x, global_id.y, global_id.z];
    do_work(&data, slab);
}

System Info

• Rustc version: 1.90
• spirv-std: from the latest main, b3eda4df9814b6176d3c0844eb67f70a22ebb378 as of this writing
• SPIR-V version:

  ❯ spirv-val --version
  SPIRV-Tools v2025.3 unknown hash, 2025-06-23T19:59:33+00:00
  Targets:
    SPIR-V 1.0
    SPIR-V 1.1
    SPIR-V 1.2
    SPIR-V 1.3
    SPIR-V 1.4
    SPIR-V 1.5
    SPIR-V 1.6
    SPIR-V 1.2 (under OpenCL 2.2 Full Profile semantics)
    SPIR-V 1.0 (under Vulkan 1.0 semantics)
    SPIR-V 1.3 (under Vulkan 1.1 semantics)
    SPIR-V 1.4 (under Vulkan 1.1 semantics)
    SPIR-V 1.5 (under Vulkan 1.2 semantics)
    SPIR-V 1.6 (under Vulkan 1.3 semantics) SPIR-V 1.6 (under Vulkan 1.4 semantics)