test/tint/expressions/type_ctor/mat4x2/explicit/vectors/f32.wgsl

let m = mat4x2<f32>(vec2<f32>(0.0f, 1.0f),
                    vec2<f32>(2.0f, 3.0f),
                    vec2<f32>(4.0f, 5.0f),
                    vec2<f32>(6.0f, 7.0f));