OK, Guys

 Am I stupid OR is the part of the following
code unexecutable?

static void
garbage_collect()
{
    ::        ::      ::         ::      ::
     if (dont_gc || during_gc) {     <=== ASSUME  <during_gc> != 0 (ie TRUE)
    if (!freelist) {
        add_heap();
       }
    return;
    }

    if (during_gc)        <====== HOW CAN THIS CODE EVER BE EXECUTED!
        return;                <======/
    during_gc++;
   ::        ::      ::         ::      ::
}

   Chuck T.