protobuf/objectivec/Tests/unittest_extension_chain_c.proto

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

package protobuf_unittest;

import "google/protobuf/unittest.proto";

// The Root for this file should end up adding the local extension and merging
// in the extensions from unittest.proto's Root.

message ChainCMessage {
  optional int32 my_field = 1;
}

extend TestAllExtensions {
  optional int32 chain_c_extension = 10003;
}