/usr/lib/mysql-testsuite/r/percona_bug1266980.result is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | SELECT GROUP_CONCAT(1, 2 ORDER BY 1, , );
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' )' at line 1
SELECT GROUP_CONCAT(1, 2 ORDER BY 1);
GROUP_CONCAT(1, 2 ORDER BY 1)
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