How to find the cause for "Internal error in ShaderStages(VERTEX) shader" in Firefox

[dplate]

I am currently developing a small webGPU game which I tested today in Firefox Nightly.

Now I get this error:
Uncaptured WebGPU error: Internal error in ShaderStages(VERTEX) shader: FXC D3DCompile error (Unbekannter Fehler (0x80004005)): C:\Program Files\Firefox Nightly\Shader@0x000002071D9E3000(102,5-83): error X3017: cannot convert from 'const typedef float3[8]' to 'float3'

As far as I understand, the shader was validated by WebGPU and then converted to HLSL, but DX12 cannot compile the result?
Can I somehow access the converted shader code (Shader@0x000002071D9E3000?), which caused the error? I assume (102,5-83) would give me a hint what I did wrong.

My vertex shader is not very complex, and I don't know, where a float3[8] comes from:

struct Camera {
  aspect: f32,
  scale: f32,
  center: vec2f,
};

struct MapVertexShaderOutput {
  @builtin(position) position: vec4f,
  @location(0) textureCoordinate: vec2f,
};

@group(0) @binding(0) var<uniform> camera: Camera;

@vertex fn vs(
  @builtin(vertex_index) vertexIndex : u32
) -> MapVertexShaderOutput {
  let pos = array(
    vec2f( -1.0,  -1.0),
    vec2f( 1.0,  -1.0),
    vec2f( -1.0,  1.0),
    vec2f( 1.0,  1.0)
  );
  var vsOutput: MapVertexShaderOutput;
  vsOutput.position = vec4f(pos[vertexIndex], 0.0, 1.0);
  vsOutput.textureCoordinate = vec2f(
    ((pos[vertexIndex][0] / 2.0) * camera.aspect / camera.scale + camera.center.x),
    ((pos[vertexIndex][1] / 2.0) / camera.scale + (1.0 - camera.center.y))
  );
  return vsOutput;
}

[dplate]

I found the reason. It was not the vertex shader, but a function used by the fragment shader with this signature:
fn getNeighbors(textureCoordinate: vec2f) -> array<vec3f, 8>

It's related to this issue:
#6845

If I wrap the array into a struct, then everything works like expected. :)

Thanks for your effort to bring WebGPU to Firefox.