040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree 2ccafa7b18080755b32870e659ddf8cc145eead1	protocol
040000 tree c0ac983ad7a62d372a37ca471640070742bbb676	types
040000 tree 60b244d9242a52e7c968094ec9c65a1caf8362f9	util