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[libprotobuf WARNING google/protobuf/compiler/parser.cc:491] No syntax specified for the proto file. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.) The release notes say a future release will turn this warning into an error. Signed-off-by: Anders Kaseorg <andersk@mit.edu>