test/tint/buffer/uniform/std140/array/mat3x3_f32/to_storage.wgsl

@group(0) @binding(0) var<uniform> u : array<mat3x3<f32>, 4>;
@group(0) @binding(1) var<storage, read_write> s : array<mat3x3<f32>, 4>;

@compute @workgroup_size(1)
fn f() {
    s = u;
    s[1] = u[2];
    s[1][0] = u[0][1].zxy;
    s[1][0].x = u[0][1].x;
}