040000 tree 8250d913f3f106a251ee25044f04c329108880be	exceptions
040000 tree f04bb3c47451f583b67b3469bc06e70a5b333c0a	protocol
040000 tree 5d35206e14e7833335f9f88baa865f8ede4f494f	types
040000 tree ebdea9e421b2355800ea1445b17521976af05cb4	util