test/tint/expressions/type_ctor/mat4x3/inferred/vectors/abstract-float.wgsl

const m = mat4x3(vec3(0.0, 1.0, 2.0),
                 vec3(3.0, 4.0, 5.0),
                 vec3(6.0, 7.0, 8.0),
                 vec3(9.0, 10.0, 11.0));

@group(0) @binding(0)
var<storage, read_write> out : mat4x3<f32>;

@compute @workgroup_size(1)
fn f() {
  out = m;
}