EXPLAIN FORMAT Does Not Work

% psql -c 'CREATE TABLE foo (id int); INSERT INTO foo VALUES (1), (2);'
INSERT 0 2
% psql -c 'EXPLAIN select count(*) from foo'
                                      QUERY PLAN                                       
---------------------------------------------------------------------------------------
 Aggregate  (cost=2.50..2.51 rows=1 width=0)
   ->  Data Node Scan on "__REMOTE_GROUP_QUERY__"  (cost=0.00..0.00 rows=1000 width=0)
         Node/s: rptdata01, rptdata02, rptdata03, rptdata04

% psql -c 'EXPLAIN (FORMAT YAML) select count(*) from foo'
connection to server was lost

2014-02-24 11:56:41 PST   22325 530659c2.5735 LOG:  server process (PID 772) was terminated by signal 11: Segmentation fault
2014-02-24 11:56:41 PST   22325 530659c2.5735 DETAIL:  Failed process was running: EXPLAIN (FORMAT YAML) select count(*) from foo
2014-02-24 11:56:41 PST   22325 530659c2.5735 LOG:  terminating any other active server processes
2014-02-24 11:56:41 PST   610 530ba39c.262 WARNING:  terminating connection because of crash of another server process
2014-02-24 11:56:41 PST   610 530ba39c.262 DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
2014-02-24 11:56:41 PST   610 530ba39c.262 HINT:  In a moment you should be able to reconnect to the database and repeat your command.
2014-02-24 11:56:41 PST   22325 530659c2.5735 LOG:  all server processes terminated; reinitializing
2014-02-24 11:56:41 PST   774 530ba3f9.306 LOG:  database system was interrupted; last known up at 2014-02-24 11:55:08 PST
2014-02-24 11:56:41 PST   774 530ba3f9.306 LOG:  database system was not properly shut down; automatic recovery in progress
2014-02-24 11:56:41 PST   774 530ba3f9.306 LOG:  redo starts at 0/2D4A788
2014-02-24 11:56:41 PST   774 530ba3f9.306 LOG:  record with zero length at 0/2D4A7E8
2014-02-24 11:56:41 PST   774 530ba3f9.306 LOG:  redo done at 0/2D4A7B8
2014-02-24 11:56:41 PST   774 530ba3f9.306 LOG:  last completed transaction was at log time 2014-02-24 19:56:08.535355+00
2014-02-24 11:56:41 PST   778 530ba3f9.30a LOG:  autovacuum launcher started
2014-02-24 11:56:41 PST   22325 530659c2.5735 LOG:  database system is ready to accept connections