Sketch.shell() broken

[MatthiasJ1]

t = sweep(Line(0,(0,10)), Polyline(0, 10, (10,0,10)))
t.shell()

IndexError: list index out of range

[gumyr]

There are no shells in that swept shape but two Faces. This is a general problem though with shell(), face(), etc - what would the preferred output be? None?

[MatthiasJ1]

Shell – a collection of faces connected by some edges of their wire boundaries

https://dev.opencascade.org/doc/overview/html/occt_user_guides__modeling_data.html