040000 tree 766e6906ca8226a3ce0e5296ceab12fc8fc654a4	exceptions
040000 tree 47f851cc09bf9b7200bcc8b22ffcfce70d7eef8b	protocol
040000 tree 99988c87d04d76f1943b6942698c67eb14558b3a	types
040000 tree 2106bb56dba34e14b6ac34f535fcf475f4358993	util