Snake problems

[gtoast]

Issue:

The first cell of The Snake example fails to evaluate. It gives the error that above "Can't position non-shapes" though its seems like they should be shapes.

Environment:

• Browser: Safari and Firefox
• Platform (Mac/Windows/Linux): Mac

URL to a gist replicating the issue (if possible/relevant)

https://www.maria.cloud/gist/bba60540e714b31dcac02eb7cdf02fbc?eval=true

[daveliepmann]

Thanks for reporting this, gtoast. We aren't able to directly change the content of plexus' snake game, and this appears to be caused by some early changes to our shapes API.

For our future bughunting: It looks like the top-level layer is the issue. I suspect we could simply add a :svg (assoc shape :x x :y y) line to position in shapes.core. Testing this hypothesis is blocked by #200.