040000 tree facce71fd05a5ffb3d7525471cfbc7805cd81b95	exceptions
040000 tree d400d1512d92972ce550061e365ffc1d46d2ba96	protocol
040000 tree 16669b967e9063b8726890f6fdf0fffa2d5ee417	types
040000 tree cd4cde648d52058b3463c49dfc7d933749bb717c	util