third_party/protobuf/3.6.1/objectivec/Tests/unittest_cycle.proto

// Protocol Buffers - Google's data interchange format
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syntax = "proto2";

package protobuf_unittest;

// Cycles in the Message graph can cause problems for message class
// initialization order.

// You can't make a object graph that spans files, so this can only be done
// within a single proto file.

message CycleFoo {
  optional CycleFoo a_foo = 1;
  optional CycleBar a_bar = 2;
  optional CycleBaz a_baz = 3;
}

message CycleBar {
  optional CycleBar a_bar = 1;
  optional CycleBaz a_baz = 2;
  optional CycleFoo a_foo = 3;
}

message CycleBaz {
  optional CycleBaz a_baz = 1;
  optional CycleFoo a_foo = 2;
  optional CycleBar a_bar = 3;
}