macro boot.janet on line 3156, column 3 (ev/spawn & body) Run some code in a new fiber. This is shorthand for (ev/call (fn  ;body)).
(ev/spawn (os/sleep 1) (print "Hard work is done!")) # prints "Hard work is done!" after one second # this is the easiest way to put some forms on the event loop # but do not forget REPL is blocking, for now, so run the example with `janet -e`