Function edge_part 

pub fn edge_part() -> Program

Three outlines sketched on the origin’s three planes, each extruded and joined to the one before, 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.