Re: SIGSEGV in munged `potential' code

[Marcus G. Daniels]

  #3  0x40233211 in __objc_forward (object=0x81029b0, sel=0x804d0c8, 
      args=0xbfffdd4c) at /src/swarm-2.1.1/libobjc/sendmsg.c:571

When it crashes, go `up' until you get here and then 
do "call sel_get_name (sel)".  That's a method that isn't implemented,
but one that you are scheduling:

  #8  0x40166104 in _i_ActionTo_c___performAction__ (self=0x8324f80, 
      _cmd=0x4017e528, anActivity=0x8104790)
      at /src/swarm-2.1.1/src/activity/Action.m:286

You should get a somewhat more illuminating error message if you
run this model with the current Swarm snapshot:

  ftp://ftp.swarm.org/pub/swarm/src/testing/swarm-2001-04-18.tar.gz

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