(lldb) r
Process 17536 launched: './queueTest1' (x86_64)
Testing the ascending queue
Inserting:  42: first insert
 17: first 17 42
{
  next: 42,
  prev: NULL
}

insert success
 -12: first -12 4296030752
{
  next: 4296030752,
  prev: NULL
}

insert success
 9982: first 9982 4296030768
{
  next: 4296030768,
  prev: NULL
}

insert success
 476: first 476 4296030784
{
  next: 4296030784,
  prev: NULL
}

insert success
 2912: first 2912 4296030800
{
  next: 4296030800,
  prev: NULL
}

insert success
 -22: first -22 4296030816
{
  next: 4296030816,
  prev: NULL
}

insert success
 3291213: end
{
  next: NULL,
  prev: 42
}

insert success
 7782: first 7782 4296030832
{
  next: 4296030832,
  prev: NULL
}

insert success

Process 17536 stopped
* thread #1: tid = 0x7b663, 0x0000000100000d2a queueTest1`que_remove(queue=0x00000001001039b0) + 154 at queueADT.c:139, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x1e6e)
    frame #0: 0x0000000100000d2a queueTest1`que_remove(queue=0x00000001001039b0) + 154 at queueADT.c:139
   136          queue->back = NULL;
   137          free(endNode);
   138      } else {
-> 139          // otherwise move back to the previous node
   140          queue->back = queue->back->previous;
   141