bcr/proto/foo.proto

syntax = "proto3";

package tests.bcr.proto;
option go_package = "example.com/foo_proto";

import "google/protobuf/empty.proto";

message Foo {
  int64 value = 1;
  google.protobuf.Empty empty = 2;
}

service Fooer {
  rpc RoundTripFoo (Foo) returns (Foo) {}
}