789       // Unknown metadata sub-block, possibly for use by a future version of the  in readControlBlock()
839       // Unknown metadata record, possibly for use by a future version of the  in readControlBlock()
874       // Unknown sub-block, possibly for use by a future version of the  in readIdentifierBlock()
915       // Unknown record, possibly for use by a future version of the  in readIdentifierBlock()
950       // Unknown sub-block, possibly for use by a future version of the  in readContextBlock()
1005       // Unknown record, possibly for use by a future version of the  in readContextBlock()
1040       // Unknown sub-block, possibly for use by a future version of the  in readObjCPropertyBlock()
1082       // Unknown record, possibly for use by a future version of the  in readObjCPropertyBlock()
1116       // Unknown sub-block, possibly for use by a future version of the  in readObjCMethodBlock()
1157       // Unknown record, possibly for use by a future version of the  in readObjCMethodBlock()
1191       // Unknown sub-block, possibly for use by a future version of the  in readCXXMethodBlock()
1232       // Unknown record, possibly for use by a future version of the  in readCXXMethodBlock()
1266       // Unknown sub-block, possibly for use by a future version of the  in readObjCSelectorBlock()
1308       // Unknown record, possibly for use by a future version of the  in readObjCSelectorBlock()
1342       // Unknown sub-block, possibly for use by a future version of the  in readGlobalVariableBlock()
1384       // Unknown record, possibly for use by a future version of the  in readGlobalVariableBlock()
1418       // Unknown sub-block, possibly for use by a future version of the  in readGlobalFunctionBlock()
1460       // Unknown record, possibly for use by a future version of the  in readGlobalFunctionBlock()
1494       // Unknown sub-block, possibly for use by a future version of the  in readEnumConstantBlock()
1536       // Unknown record, possibly for use by a future version of the  in readEnumConstantBlock()
1570       // Unknown sub-block, possibly for use by a future version of the  in readTagBlock()
1611       // Unknown record, possibly for use by a future version of the  in readTagBlock()
1645       // Unknown sub-block, possibly for use by a future version of the  in readTypedefBlock()
1686       // Unknown record, possibly for use by a future version of the  in readTypedefBlock()
1858       // Unknown top-level block, possibly for use by a future version of the  in APINotesReader()