040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree c6623d5e4ffc538fad321feecf4d6fbcb95cbe79	protocol
040000 tree a358a0c350731ee70e96206e841f81f3bb6e9826	types
040000 tree d794f5078cbde5467a9568b29760399e683a5eb7	util