if one mistypes a variable name in schedule.ccl then there is debug output produced to screen (or at least this better be debug output and not intended for regular user level error messages). Note the rwdw.pl file name reference somewhere in the middle of the Perl hash dump.

CST error in /autofs/nccs-svm1_home1/haas/ET/Cactus/repos/flesh/lib/sbin/CreateScheduleBindings.pl (at 795)
  -> Could not determine gtype for 'regcheck::rhshar'

Use of uninitialized value in string eq at /autofs/nccs-svm1_home1/haas/ET/Cactus/repos/flesh--

Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2743/debug-output-from-rdwrpl-when-it-cannot