It's a little bug left from 3.1 :-)

the standard prism from the INSERT-menu does not parse !!
-------------------------------------------------
// extrude a closed 2-D shape along an axis
prism {
  linear_sweep // or conic_sweep for tapering to a point
  cubic_spline // linear_spline | quadratic_spline | cubic_spline
  -0.5,        // height 1
   0.5,        // height 2
  10,          // number of points
  // the <u,v> points
  < 0.2, -1.0>, < 0.2,  0.2>, < 1.0, -0.2>, < 1.0,  0.2>, < 0.2,  1.0>,
  <-0.2,  1.0>, <-1.0,  0.2>, <-1.0, -0.2>, <-0.2,  0.2>, <-0.2, -1.0>
  // [open]
  // [sturm]
}
------------------------------------------------------
it should be linear_spline, all others fail.
bezier_spline option is missing

The corrected version:
-------------------------------------------------
// extrude a closed 2-D shape along an axis
prism {
  linear_sweep // or conic_sweep for tapering to a point
  linear_spline // linear_spline | quadratic_spline | cubic_spline |
bezier_spline
  -0.5,        // height 1
   0.5,        // height 2
  10,          // number of points
  // the <u,v> points
  < 0.2, -1.0>, < 0.2,  0.2>, < 1.0, -0.2>, < 1.0,  0.2>, < 0.2,  1.0>,
  <-0.2,  1.0>, <-1.0,  0.2>, <-1.0, -0.2>, <-0.2,  0.2>, <-0.2, -1.0>
  // [open]
  // [sturm]
}
------------------------------------------------------
8)  SciBorg

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It's great ! Thanks to all POV-Creators !

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