040000 tree b98be1724a29e3728351f4a8689e2fcd975b5f3c	exceptions
040000 tree 5768ea1b700c940c854c0722aa4787c0b5e666f3	protocol
040000 tree 6d112a439680f7079a65a8a3761186795cb6559e	types
040000 tree db99a2b6175fe2df40dacb69857ab163003473c2	util