040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree 783deeeecb57e00ef9e7d9de17422445d376d632	protocol
040000 tree 6c088a6c9e4f9a8a6be55d41f2f71fafad1da3a2	types
040000 tree 4fcc3fcc072fb13dcec67247aa743023ceeb53dc	util