template Tuple (E...)
{
    alias Tuple = E;
}

void main ()
{
    // Would be a string tuple.
    alias SomeTuple = Tuple!();
    int[string] map = [];

    // Does not work. `i` is not known at compile time. Intentional.
    // `foreach (int i, string e; SomeTuple)` would make it work.
    for (int i = 0; i < SomeTuple.length; ++i)
    {
        // This crashes DMD.
        auto a = map[SomeTuple[i]];
    }
}