040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree 2cb5799bbbbf6fbc79053e745ebbff0839eb42a0	protocol
040000 tree d050cebf4dc9a0dbc5ef028f36dd4f2c01098336	types
040000 tree d794f5078cbde5467a9568b29760399e683a5eb7	util