$(D_PSYMBOL range) with its front element removed.
Precondition: !range.empty. range is extracted from this list.
auto list = SList!int([5, 234, 30]); auto range = list[]; range.popFront(); assert(list.popFirstOf(range).front == 30); range = list[]; assert(range.front == 5); range.popFront; assert(range.front == 30); range.popFront; assert(range.empty);
Removes the front element of the range from the list.