How is `auto` and not `alias` appropriate for alias sequences?

[Shriramana Sharma via Digitalmars-d]

Hello. I just found that the following code compiles without any problem:

    struct Foo { int val; string name; }
    Foo foo = {1, "one"};
    auto t = foo.tupleof;

Trying to use `alias` i.o. `auto` above fails.

Now IIUC, trying to take the address of t fails, so it's still a compile-
time-only construct without "real" i.e. runtime existence. The tuple is in 
fact an AliasSeq, no? In which case, I would have thought that `alias` (for 
compile-time symbols) and not `auto` (for runtime variables) would be the 
appropriate choice.

Can someone please explain this situation? Thanks.

-- 
Shriramana Sharma, Penguin #395953