040000 tree 88b87f8388c7ae68ac9828128972c90ad66d5fdf	exceptions
040000 tree 783deeeecb57e00ef9e7d9de17422445d376d632	protocol
040000 tree 778eff9ff6f5982a4bd8eab45d74e334b7ee4244	types
040000 tree 269459d830dd6ccfb6084f2869e1433d4059313a	util