Hi,

I'm wondering how would one go about implementing self-referential
data structures?  As an exercise, I tried to implement a PB version of
the adjacency list representation of a graph. I'm having a hard time
getting it work. Any suggestions?

Thanks!

--- graph.proto ---

package graph;

option java_package = "graph";
option java_outer_classname = "UndirectedGraph";
option optimize_for = CODE_SIZE;

message UndirectedGraphNode {
  required string id = 0;
  repeated UndirectedGraphNode neighbors;
}

message UndirectedGraph {
  repeated UndirectedGraphNode nodes;
}

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