pebble/third_party/nanopb/tests/regression/issue_407/extensions.proto

syntax = "proto2";

message SimpleMessage {
  optional uint32 number = 1;
  extensions 100 to max;
}

message ExtMessage {
  extend SimpleMessage {
    optional ExtMessage ext_message_ext = 1100;
  }
  optional uint32 second_number = 1;
}