--- /dev/null
+
+puts "================"
+puts "OCC141"
+puts "================"
+puts ""
+###############################################
+## exception while do segment operation on BSpline curve.
+###############################################
+
+restore [locate_data_file OCC141.draw] result
+#### checkshape res # not a topological shape
+
+segment result -4.76283758432072e-05 1.06458532027221
+
+#let's the segment is displaied only
+
+set 2dviewer 0