040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree c1c3797a4e508bd62b44cf67ca4fbca0191e216f	protocol
040000 tree a358a0c350731ee70e96206e841f81f3bb6e9826	types
040000 tree bd015b6be15d1cd8c5608dfc810ba587a0aacbf1	util