BINLOG_GTID_POS(..) does not return proper error unless mysql_store_result is called

#include <my_global.h>

#include <mysql.h>

int main(int argc, char **argv)

{  

	MYSQL con;

	mysql_init(&con);

	if (mysql_real_connect(&con, "127.0.0.1", "root", "", 

		"test", 3306, NULL, 0) == NULL) 

	{

		fprintf(stderr, "ERROR: %s\n", mysql_error(&con));

		exit(1);

	}

	mysql_query(&con,"select binlog_gtid_pos('a',1)");

	// If I call mysql_store_result(&con) here, everything works.

	// If I call mysql_use_result(&con) or nothing at all, there is no error

	fprintf(stderr,"Here should be an error: %s\n",mysql_error(&con));

	mysql_close(&con);

}

use DBD::mysql;

use strict;

my $dsn = "dbi:mysql:host=127.0.0.1:port=3306:user=root:database=test";

my $dbh = DBI->connect($dsn);

unless (defined $dbh) {

	print STDERR "Could not connect to $dsn\n";

	exit(1);

}

my $sth = $dbh->prepare("SELECT binlog_gtid_pos('a',1)");

# If I set mysql_store_result here, or nothing at all, everything works.

# If I set mysql_use_result, it does not

$sth->{'mysql_use_result'}=1;

unless (defined $sth) {

	print STDERR $dbh->errstr(), "\n";

	exit(1);

}

$sth->execute();

print "Here should be an error: ", $sth->errstr(), "\n";

$sth->finish();

$dbh->disconnect();

Here should be an error: 

revision-id: monty@askmonty.org-20140222011156-i1pa6zm2iltb4usv

revno: 4007

branch-nick: 10.0