040000 tree 5c1ca6ed9c7c210b68166780f89e0c6062a6b88d	annotations
040000 tree 5de008069ba6ff8c71e7470c60a8b0ec2cd35d2e	exceptions
040000 tree d6bec74f103fc277a6aafabceefdad656b268637	protocol
040000 tree 4dc529cc210d4ab3294976b4c82d6381c3d4e8c1	types
040000 tree bdfea1a824e96b3be1ca4038667205218f88f4a9	util