objectivec/Tests/unittest_extension_chain_a.proto

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

package protobuf_unittest;

import "google/protobuf/unittest.proto";

import "unittest_extension_chain_b.proto";
import "unittest_extension_chain_c.proto";
import "unittest_extension_chain_d.proto";

// The Root for this file should end up adding the local extension and merging
// in the extensions from D's Root (unittest and C will come via D's).

message ChainAMessage {
  optional ChainBMessage b = 1;
  optional ChainCMessage c = 2;
  optional ChainDMessage d = 3;
}

extend TestAllExtensions {
  optional int32 chain_a_extension = 10001;
}