tupleof feature request

[bc]

i was thinking, it would be nice if you could do some of these things:

import std.stdio;

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

alias Tuple!(int, int) TL;

void main()
{
	TL tl;
	struct S
	{
		int x;
		int y;
	}
	S s;
	s.x = 1;
	s.y = 2;
	
	tl = s.tupleof;
	/* gives:
	C:\Code\D\Test\testtuple.d(21): Error: tl is not an lvalue
	C:\Code\D\Test\testtuple.d(21): Error: forward reference to type (int,  
int)
	C:\Code\D\Test\testtuple.d(21): Error: cannot implicitly convert  
expression (tuple((s.X),(s.Y))) of type (int, int) to (int, int)
	*/
	auto tl2 = s.tupleof;
	writefln(tl2);
	// this outputs '00'. would be nicer if it did '12'
	tl2 = s.tupleof; // doesn't compile
	s.tupleof = tl2; // doesn't compile
}