/tmp/log inacessible in error_log("setting: ". $full_key . gmdate('c') . "\n", 3, '/tmp/log');

this is in the 1.x dev version. are you sure this is supposed to be there, or was it some debug cruft left in? I guess my server doesn't have access to /tmp/log. I got error while running a drush command.

line 83 dmemcache.inc :: error_log("setting: ". $full_key . gmdate('c') . "\n", 3, '/tmp/log');