Go has surprisingly little in common with Oberon or Modula (mostly the receiver syntax of Oberon-2 bound procedures). The coroutines were not a language feature

Go has surprisingly little in common with Oberon or Modula (mostly the receiver syntax of Oberon-2 bound procedures). The coroutines were not a language feature of Modula, but a library feature; also the Oakwood guidelines of Oberon (not by the original authors) include a coroutine API, but I'm not sure whether there was a working implementation.