title: none return value function in Golang
body: <p>While I was reading "the little go" book, I found that it suggests to write a function without any return value. So I proceed to test that function but the program won't compile and give me this "... used as value"error. Anyone knows what is going on here?</p>
  
  <pre><code>package main
  
  import (
      "fmt"
  )
  
  func log(message string) {
      fmt.Println(message)
  }
  
  func main() {
      msg := log("just a message")
      fmt.Println(msg)
  }
  </code></pre>
  
  <p>I know that this function is trivial (maybe the question is stupid also). But I am just curious to know if this type of function legal in Go?</p>