clean up stuck/vanish case for drivers, now that parking blackholes have been fixed

sim/src/router.rs

@@ -182,14 +182,7 @@ impl Router {
                                 self.path.add(step, map);
                             }
                         } else {
-                            // TODO Fix by avoiding parking blackholes in the first place.
+                            panic!("{} can't find parking on {}, and also it's a dead-end, so they'll be stuck there forever. Vanishing. Parking blackholes were wrong?", vehicle.id, current_lane);
-                            println!("{} can't find parking on {}, and also it's a dead-end, so they'll be stuck there forever. Vanishing.", vehicle.id, current_lane);
-                            // TODO Hmm, actually, this might not be a border -- it just inevitably
-                            // leads only to a border.
-                            self.goal = Goal::EndAtBorder {
-                                end_dist: map.get_l(current_lane).length(),
-                                i: map.get_l(current_lane).dst_i,
-                            };
                         }
                         return Some(ActionAtEnd::GotoLaneEnd);
                     }

sim/src/trips.rs

@@ -388,16 +388,7 @@ impl TripManager {
         let trip = &mut self.trips[self.active_trip_mode.remove(&AgentID::Car(car)).unwrap().0];
         match trip.legs.pop_front().unwrap() {
             TripLeg::Drive(_, DrivingGoal::Border(int, _)) => assert_eq!(i, int),
-            _ => {
+            _ => unreachable!(),
-                // TODO Should be unreachable
-                println!(
-                    "Aborting {} at {} because {} couldn't find parking and got stuck",
-                    trip.id, now, car
-                );
-                self.unfinished_trips -= 1;
-                trip.aborted = true;
-                return;
-            }
         };
         assert!(trip.legs.is_empty());
         assert!(!trip.finished_at.is_some());