sudo puppet --verbose --debug cron.pp
debug: Creating default schedules
debug: Prefetching crontab resources for cron
info: Applying configuration version '1263435950'
debug: //Cron[cron2]: Changing ensure
debug: //Cron[cron2]: 1 change(s)
notice: //Cron[cron2]/ensure: created
debug: Flushing cron provider target root
"-":6: bad hour
errors in crontab file, can't install.
debug: //Cron[cron3]: Changing ensure
debug: //Cron[cron3]: 1 change(s)
notice: //Cron[cron3]/ensure: created
debug: Flushing cron provider target root
"-":6: bad hour
errors in crontab file, can't install.
debug: //Cron[cron1]: Changing ensure
debug: //Cron[cron1]: 1 change(s)
notice: //Cron[cron1]/ensure: created
debug: Flushing cron provider target root
"-":6: bad hour
errors in crontab file, can't install.
debug: Finishing transaction 549668820 with 3 changes

$ cat cron.pp
cron { cron1:
    command => "/bin/true",
    user => root,
    hour => 2,
    minute => 0
}

cron { cron2:
    command => "/bin/true",
    user => root,
    hour => [2, 4]
}

cron { cron3:
    command => "/bin/true",
    user => root,
    hour => ['2-4'],
    minute => '*/10'
}