Property change problem

[Jarrett Billingsley]

"Zarathustra" <adam.chrapkowski at gmail.com> wrote in message 
news:g62dv7$gao$1 at digitalmars.com...

>  l_bar.foo.u.a = 5;   // no effect

I really wish the compiler could catch stuff like this.  It has no effect 
because it's doing something like this:

auto temp = l_bar.foo.u;
temp.a = 5;

And then throwing away 'temp'.  That is, it's not modifying l_bar.foo.u, 
it's modifying a temporary copy of it.

It would work if u() returned an SSome* (that is, "return &this.m_u;"), but 
I don't know if that's acceptable for you.