040000 tree 54abf26a6f4cd1cdf9fc14af09e671174d0ab1f4	exceptions
040000 tree 560303ba62d2361067935b14636aaeaa687309ea	protocol
040000 tree 328f8338a2287b8ddb2a1e8f34394cd5c66bcd06	types
040000 tree b0772ea7491169e2f0a1dc2dddba6170c3363db4	util