// the types DB_TXN and so forth have been defined.
// This list structure is repeated here (from toku_list.h) so that the db.h file will be standalone. Any code that depends on this list matching the structure in toku_list.h
// will get flagged by the compiler if someone changes one but not the other.
// will get flagged by the compiler if someone changes one but not the other. See #2276.