Thanks for the reference. I hadn't seen UFO, but I had been aware of ToonTalk and Janus and the actor model.

On Thu, Apr 23, 2020 at 3:00 PM Mario Wolczko mario-at-wolczko.com |pub yahoo| <> wrote:

Have you read about UFO (United Functions and Objects) by John Sargeant, c.1992? It wasn’t prototype-based, but your email otherwise brought it to mind. There’s an overview paper here:

https://www.semanticscholar.org/paper/United-Functions-and-Objects%3A-an-Ove... https://www.semanticscholar.org/paper/United-Functions-and-Objects:-an-Overview-United-an-Sargeant/4be0e681e838f435ab67c0bde9fd6b05c3eef52d and several other papers can be found.

There was a spate of concurrent OO logic language papers in the late 80s/early 90s. A skim of OOPSLA proceedings from that era should turn up many. And before that there was ThingLab (in Smalltalk).