Fix a bug with linked list where back ptr wasn't updating after an append.
Fix a bug with linked list where back ptr wasn't updating after an append.

robobrobro/ballin-octo-shame,robobrobro/ballin-octo-shame,robobrobro/ballin-octo-shame,robobrobro/ballin-octo-shame,robobrobro/ballin-octo-shame,robobrobro/ballin-octo-shame,robobrobro/ballin-octo-shame,robobrobro/ballin-octo-shame