[srparish]

They had the limbo language in plan9, which has similar features and quirks. It seems most probable that the outcome of the 45 minute conversation wasn't "let's build a language from scratch", but rather "let's iterate on limbo".

[pjmlp]

You can get the details here,

"Creating the Go programming language featuring Rob Pike & Robert Griesemer"

https://changelog.com/gotime/100

There are other sources as well, this was just the one that quickest came to mind.