module utility;

auto concat(T : E[n], E, size_t n)(in E[][] args...) @nogc
{
    size_t offset = 0;
    T result = void;
    foreach(arr; args) {
        result[offset .. offset+arr.length] = arr;
        offset += arr.length;
    }
    assert(offset == result.length);
    return result;
}