040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree 12f22d0dc2a83b8c41e85053549d6d417da23277	protocol
040000 tree 8c338343901e8eb36dafe014368505383ae434f3	types
040000 tree d794f5078cbde5467a9568b29760399e683a5eb7	util