040000 tree 6014d30ddf2a09f7fdeb63010426ab13e4c21df6	exceptions
040000 tree 0598669d480dca40c64389ece4c6f0dfd64e31cd	protocol
040000 tree 8718566bf4864b9a9f77f9bd765c4529e33e13ae	types
040000 tree 1563d2be748fc03c2eaab27c9dba71367b432521	util