dawn-cmake/test/ptr_ref/access/matrix.wgsl

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@stage(compute) @workgroup_size(1)
fn main() {
var m : mat3x3<f32> = mat3x3<f32>(vec3<f32>(1., 2., 3.), vec3<f32>(4., 5., 6.), vec3<f32>(7., 8., 9.));
let v : ptr<function, vec3<f32>> = &m[1];
*v = vec3<f32>(5., 5., 5.);
}