pop & popFront combined

["Nordlöw" via Digitalmars-d-learn]

On Saturday, 1 November 2014 at 20:48:45 UTC, Nordlöw wrote:
> Is there a suitable trait we can use to detect this and in turn 
> use to disallow stealFront() and stealBack() in these cases?

Made it a separate new question at

http://forum.dlang.org/thread/onibkzepudfisxtrigsi@forum.dlang.org#post-onibkzepudfisxtrigsi:40forum.dlang.org