*** must show one record, of the active binlog, left in the index file after PURGE ***
show binary logs;
Log_name File_size
master-bin.000004 #
reset master;
flush logs;
flush logs;
flush logs;
purge binary logs TO 'master-bin.000002';
ERROR HY000: Fatal error during log purge
show warnings;
Level Code Message
Error 1377 a problem with deleting MYSQLTEST_VARDIR/log/master-bin.000001; consider examining correspondence of your binlog index file to the actual binlog files