Function conebox 

pub fn conebox() -> Program

A box, and a double cone revolved beside it from a sketch on a datum plane turned 45 degrees about the box’s top edge, as drawn in the editor.

An example drawn in the editor and kept as the program it saved (in src/drawn/): its sketches as they were drawn, which no code says better. Its tests build it like every other example, so a change to the format that breaks it is found there: save it again from the editor.