MDB_DBI_CHANGED(,MAIN_DBI) is never true.
@ -9536,7 +9536,7 @@ int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del)
if (F_ISSET(txn->mt_flags, MDB_TXN_RDONLY))
return EACCES;
if (dbi > MAIN_DBI && TXN_DBI_CHANGED(txn, dbi))
if (TXN_DBI_CHANGED(txn, dbi))
return MDB_BAD_DBI;
rc = mdb_cursor_open(txn, dbi, &mc);