test/tint/expressions/type_ctor/mat2x4/explicit/vectors/f32.wgsl

let m = mat2x4<f32>(vec4<f32>(0.0f, 1.0f, 2.0f, 3.0f),
                    vec4<f32>(4.0f, 5.0f, 6.0f, 7.0f));