fix build when let expressions aren't available
fix build when let expressions aren't available

dicej/avian,bigfatbrowncat/avian-pack.avian,lostdj/avian,bgould/avian,lwahlmeier/avian,bgould/avian,getlantern/avian,bgould/avian,joshuawarner32/avian,minor-jason/avian,minor-jason/avian,MaartenR/avian,marcinolawski/avian,lostdj/avian,ucdseniordesign/avian,bigfatbrowncat/avian-pack.avian,dicej/avian,lwahlmeier/avian,minor-jason/avian,ucdseniordesign/avian,dicej/avian,lostdj/avian,bgould/avian,getlantern/avian,marcinolawski/avian,minor-jason/avian,joshuawarner32/avian,lwahlmeier/avian,marcinolawski/avian,ucdseniordesign/avian,ucdseniordesign/avian,MaartenR/avian,bigfatbrowncat/avian-pack.avian,getlantern/avian,getlantern/avian,joshuawarner32/avian,MaartenR/avian,joshuawarner32/avian,lwahlmeier/avian,bigfatbrowncat/avian-pack.avian,MaartenR/avian,marcinolawski/avian,dicej/avian,lostdj/avian