<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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:<div class=""><a href="https://www.semanticscholar.org/paper/United-Functions-and-Objects:-an-Overview-United-an-Sargeant/4be0e681e838f435ab67c0bde9fd6b05c3eef52d" class="">https://www.semanticscholar.org/paper/United-Functions-and-Objects%3A-an-Overview-United-an-Sargeant/4be0e681e838f435ab67c0bde9fd6b05c3eef52d</a></div><div class="">and several other papers can be found.</div><div class=""><br class=""></div><div class="">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).</div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>