SharedPtr.toHash

{
	SharedPtr!long x = SharedPtr!long.make(123);
	SharedPtr!long y = SharedPtr!long.make(123);
	assert(x.toHash == x.toHash);
	assert(y.toHash == y.toHash);
	assert(x.toHash != y.toHash);
	SharedPtr!(const long) z = x;
	assert(x.toHash == z.toHash);
}
{
	SharedPtr!long x;
	SharedPtr!(const long) y;
	assert(x.toHash == x.toHash);
	assert(y.toHash == y.toHash);
	assert(x.toHash == y.toHash);
}