040000 tree 54abf26a6f4cd1cdf9fc14af09e671174d0ab1f4	exceptions
040000 tree d45bec6a5501b6d379d7fd3b03dc8c56c0473d7b	protocol
040000 tree 9badd6a97986d74861c068b0456e68b6d4aca88b	types
040000 tree aa0acee9ad7184991425ecabc66f4e06fcb5c3a6	util