godebugtester run 
fail contains stdout "recv: 1"
fail contains stdout "recv: 2, 3"

-- go.mod --
module mod1
-- main.go --
package main
func main() {
	f1(1)
}
// some comment that is disabling annotateoff
// some comment that is disabling annotateoff
//godebug:annotateoff
func f1(v int)(int,int){
	return 2,3
}

   