040000 tree 54abf26a6f4cd1cdf9fc14af09e671174d0ab1f4	exceptions
040000 tree 25c6ee4ce30e0b27306f525730a4842187d5316c	protocol
040000 tree 0547b209c3c4622949cef186b6355a91fed6bfb4	types
040000 tree b0772ea7491169e2f0a1dc2dddba6170c3363db4	util