040000 tree 8250d913f3f106a251ee25044f04c329108880be	exceptions
040000 tree 5a125750de746b8834dcfb3d0f70dc746a2f2e2e	protocol
040000 tree 1f467c00e65f8a9a238e1928aff259c739aa616f	types
040000 tree ebdea9e421b2355800ea1445b17521976af05cb4	util