Preparing a HANDLER statement fails with the following assertion:

mysqld: sql_class.cc:563: void Diagnostics_area::set_ok_status(THD*, ha_rows, ulonglong, const char*): Assertion `! is_set()' failed.

backtrace:

1. 2011-01-05T13:30:54 #8 0x006b0d98 in __assert_fail () from /lib/libc.so.6
2. 2011-01-05T13:30:54 #9 0x0826db43 in Diagnostics_area::set_ok_status (this=0xa72eea8, thd=0xa72dc70, affected_rows_arg=0, last_insert_id_arg=0,
3. 2011-01-05T13:30:54 message_arg=0x88df29b "Statement prepared") at sql_class.cc:563
4. 2011-01-05T13:30:54 #10 0x081b1b01 in my_ok (thd=0xa72dc70, affected_rows=0, id=0, message=0x88df29b "Statement prepared") at sql_class.h:2601
5. 2011-01-05T13:30:54 #11 0x0834efcd in mysql_sql_stmt_prepare (thd=0xa72dc70) at sql_prepare.cc:2381
6. 2011-01-05T13:30:54 #12 0x0829ad71 in mysql_execute_command (thd=0xa72dc70) at sql_parse.cc:2239
7. 2011-01-05T13:30:54 #13 0x082a68da in mysql_parse (thd=0xa72dc70,
8. 2011-01-05T13:30:54 rawbuf=0xa7422d8 "PREPARE h_r FROM ' HANDLER `table100_myisam_int_autoinc` READ `PRIMARY` LAST WHERE `col_int_not_null_key` >= 239 '", length=115,
9. 2011-01-05T13:30:54 found_semicolon=0x91598228) at sql_parse.cc:6078
10. 2011-01-05T13:30:54 #14 0x08298840 in dispatch_command (command=COM_QUERY, thd=0xa72dc70,
11. 2011-01-05T13:30:54 packet=0xa734459 " PREPARE h_r FROM ' HANDLER `table100_myisam_int_autoinc` READ `PRIMARY` LAST WHERE `col_int_not_null_key` >= 239 ' ",
12. 2011-01-05T13:30:54 packet_length=117) at sql_parse.cc:1211
13. 2011-01-05T13:30:54 #15 0x08297caa in do_command (thd=0xa72dc70) at sql_parse.cc:904
14. 2011-01-05T13:30:54 #16 0x08294d86 in handle_one_connection (arg=0xa72dc70) at sql_connect.cc:1154
15. 2011-01-05T13:30:54 #17 0x00821919 in start_thread () from /lib/libpthread.so.0
16. 2011-01-05T13:30:54 #18 0x0076acce in clone () from /lib/libc.so.6
17. 2011-01-05T13:30:54 #5 0x004d5424 in __kernel_vsyscall ()

test case (this query is the entire test case):

PREPARE h_r FROM ' HANDLER t1 READ `PRIMARY` LAST ';

Note that historically there have been numerous bugs around the Diagnostics_area assertions, many of them fixed in mysql