040000 tree 4c5b234f9fe575254cbbbec2dd227c789fddd1f7	annotations
040000 tree fc2061d7eba98c4e0a4224356f71642a071bb115	exceptions
040000 tree 2cb219c1b064c13a8782ce112a995356fd468481	protocol
040000 tree caa615092354feaca8024989150323811965201d	types
040000 tree 1e99b96fcbcdc679ea64ef107116d3f905eec514	util