learn-wgpu 0.1.0

I am trying to learn wgpu
Documentation 
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// src/shader.wgsl
// Vertex Shader
struct VertexOutput {
    
    @builtin(position) clip_position: vec4<f32>,
    
};

@vertex
fn vs_main(

    @builtin(vertex_index) in_vertex_index: u32,

) -> VertexOutput {
    
    var out: VertexOutput;
    let x = f32(1 - i32(in_vertex_index)) * 0.5;
    let y = f32(i32(in_vertex_index & 1u) * 2 - 1) * 0.5;
    out.clip_position = vec4<f32>(x, y, 0.0, 1.0);
    return out;    
}

// Fragment Shader
@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
    
    return vec4<f32>(0.3, 0.2, 0.1, 1.0);    
}