040000 tree 8250d913f3f106a251ee25044f04c329108880be	exceptions
040000 tree 3449cc626fdf8278e722e6ca712b11a76ffe42e7	protocol
040000 tree e609373224abc7c437c36a0be9ce131db0e5d9b1	types
040000 tree ebdea9e421b2355800ea1445b17521976af05cb4	util