static arrays at runtime with templates ?

[Emil via Digitalmars-d-learn]

I tried this on a whim and it appears to work:

auto static_array(T, size_t data_size)()
{
    T[data_size] data;
    return data;
}
void main() {
    import std.stdio: writeln;
    import std.traits: isStaticArray;

    auto data = static_array!(int, 5)(3);
    writeln(data);
    static assert(__traits(isStaticArray, data));

    auto data_longer = static_array!(int, 6)(2);
    writeln(data_longer);
    static assert(__traits(isStaticArray, data_longer));
}


Is this for real, static arrays at runtime without manually 
allocating memory ? Is this legitimate or should I expect 
problems ?