The following scene bombs out with an error message:

#version unofficial MegaPov 0.4
#include "colors.inc"
isosurface{
//      function {pow(x,2)} also bombs out
//      function {sin(x)}   does not bomb out.
        function {mod(x,2)}
        threshold 10
        accuracy 0.01
        contained_by
                {sphere {0, 160}}
        pigment {Green}
                     }
camera
{
  location  <0, 5, -300>
  look_at   <0, 5,  0.0>
}
light_source {<12, 3, -51.8056> color White}
light_source {<0, 2251.8056, 0> color White}

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