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[Gene <>]

I'm testing the example program

     examples/Arrangement_on_surface_2/Bezier_curves.cpp

using input:
--------
2
2 256 0 0 0
4 215 175 251 100 214 25 205 0
--------

I get the following exception:
--------
$ Bezier_curves test1.dat
B = {2  256 0  0 0}
B = {4  215 175  251 100  214 25  205 0}
terminate called after throwing an instance of 'CGAL::Assertion_exception'
  what():  CGAL ERROR: assertion violation!
Expr: nt_traits.degree (*p_polyY) >= 0
File: /usr/include/CGAL/Arr_geometry_traits/Bezier_curve_2.h
Line: 767
Abort
--------

Note that the target point of the cubic curve is collinear with the
endpoints of the degree-1 curve.  Is it significant?

Here is a similar example that does not throw an exception:
--------
2
2 256 0 0 0
4 56 144 37 94 96 21 118 0
--------
$ Bezier_curves test1.dat
B = {2  256 0  0 0}
B = {4  56 144  37 94  96 21  118 0}
The arrangement size:
   V = 5,  E = 4,  F = 1
--------

What am I missing?

Thanks,
Gene
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