test/expressions/type_ctor/mat3x3/explicit/vectors/f32.wgsl

let m = mat3x3<f32>(vec3<f32>(0.0, 1.0, 2.0),
                    vec3<f32>(3.0, 4.0, 5.0),
                    vec3<f32>(6.0, 7.0, 8.0));