040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree d816c059125a37c5628c879f1e1250ca80084078	protocol
040000 tree 6167d59a995978f3ca794920ad1dabec29084cbf	types
040000 tree c1ab216a9cea09c614ea6eecbb793f8e5132d738	util