Examples of using "Pattern Library"

In the CL documentation there is a section for “Pattern Library”. Does anyone have an example of using the “Pattern Library”? I’m especially interested in “negative”.

Hey Jeff! Pattern library is an internal feature at the moment (it’s still pretty thorny) but we’ll be sure to document it once it becomes publicly available.

Any particular reason you’re interested in negative? There’s a good chance that what you want is probably not even best served using the pattern library.

Mostly just curious-- working on feedback for a slide but just used a function in a graph to make it work.