040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree 7be61baed713d5ee9d519d2d49b40a4bf54f7cb4	protocol
040000 tree c0ac983ad7a62d372a37ca471640070742bbb676	types
040000 tree 60b244d9242a52e7c968094ec9c65a1caf8362f9	util