Given a message (b of type B), nested in another (a of type A); how does 
one get ‘a’?
I was hoping for something like ‘b.getParent()’.

message B { optional string name = 1;  repeated B b = 2; }
message A { optional string name = 1;  repeated B b = 1; }

Here is an example instance of an ‘a’ with textual serialization.

name: "a"
b { name: “foo”
      b { name: “fred”
            b { name: “flintstone” }}}
b { name: “bar” }
b { name: “baz” }

The issue is that I am navigating the collection 'a' with a visitor and I 
need to be able to reconstruct a full name composed of names of all the 
ancestors.

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