040000 tree facce71fd05a5ffb3d7525471cfbc7805cd81b95	exceptions
040000 tree becfd29f02b3e8f7a65a9a6b9642f740dc4e1687	protocol
040000 tree a68ee361e39f18bf0424388e024a21a07c40805c	types
040000 tree 6a77736473fa45edd9a0bcb46b9d8091b6a89e81	util