Need help understanding Tuple

[d coder]

Greetings

Somebody please help me understand why we need the Tuple template in the
following code. Does not __traits(getAttributes, foo.a) return a tuple? So
what is the Tuple template doing here? Converting a tuple to a tuple?

Also where to learn more about tuples in D. Info in TDPL is sketchy.

Regards
- Puneet

template Tuple(T...) {
  alias T Tuple;
}

enum Bar;
class Foo {
  @Bar int a;
}

void main()
{
  Foo foo = new Foo;
  alias Tuple!(__traits(getAttributes, foo.a)) tp;
  pragma(msg, tp);
}
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