040000 tree facce71fd05a5ffb3d7525471cfbc7805cd81b95	exceptions
040000 tree 26741c9ac226aae49783a2c730a81ed15dc3b58d	protocol
040000 tree 44e534d84fab11b635f2b8ac7271e9ea03e98865	types
040000 tree 24131c2c74f8c7058ac30ac88a49fda7f32dedaa	util