https://en.wikipedia.org/wiki/Plan_9_from_Bell_Labs

he also at the time invented a language called Newsqueak (a language for mice) which the concurrency elements, the channels and coroutines, almost exactly landed in Golang, and was the main author of Acme and though it was 1992 before it hit official release, if you read up on it, it was definitely already being prototyped before HTML appeared (which is a derivative of SGML, which is also the root of Postscript, and goes back to the late 70s)

the real root, i would say, though, is not relaly Pike but Wurth, who invented Oberon, which is an integrated GUI and programming language that used modules (like Go packages) and a paning window environment... it was similar in some ways to Smalltalk, which led to Windows and MacOS, but different in that it was focused on programming and scripting

back in those days, i dreamed of running a full Oberon 2 environment, but sadly all i ever got was to read about it in obscure computer magazines