040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree 2cb5799bbbbf6fbc79053e745ebbff0839eb42a0	protocol
040000 tree 3bf33e6850bc31d82adf2157ee9502c926519e54	types
040000 tree d794f5078cbde5467a9568b29760399e683a5eb7	util