(10:37:59) ERROR: /var/lib/buildkite-agent/builds/bk-docker-p8pd/bazel-downstream-projects/cartographer/cartographer/BUILD.bazel:25:1: in srcs attribute of BazelCcProtoAspect aspect on proto_library rule //cartographer:protos: The 'srcs' attribute of '//cartographer:protos' contains protos for which 'cc_proto_library' shouldn't generate code (external/com_google_protobuf/google/protobuf/empty.proto), in addition to protos for which it should (cartographer/common/proto/ceres_solver_options.proto, cartographer/ground_truth/proto/relations.proto, cartographer/mapping/proto/2d/cell_limits.proto,