(lldb) up
frame #21: 0x000000010012468c openttd`RoadVehicle::GetMaxTrackSpeed() const + 284
openttd`RoadVehicle::GetMaxTrackSpeed:
-> 0x10012468c <+284>: leaq 0x308d3b(%rip), %rdi ; "Assertion failed at line %i of %s: %s"
0x100124693 <+291>: leaq 0x310a31(%rip), %rdx ; "/Users/andy2/workspace/OpenTTD.andythenorth/src/road_map.h"
0x10012469a <+298>: leaq 0x310a65(%rip), %rcx ; "MayHaveRoad(t)"
0x1001246a1 <+305>: movl $0xa6, %esi