gistfile1.clj

(defn say-hello [person] println "hello" person)

(say-hello "Mark")
-> "Mark"


If I put the brackets in then it'll work fine:

(defn say-hello [person] (println "hello" person))

(say-hello "Mark")
-> hello mark
nil

So that means 'println' was evaluated with the two arguments...
So what happens in the first case where I don't include the brackets? It just output the values?

In which case...

(defmacro say-hello [person]
  'println "Hello" person)

Why does this expand like so?

(macroexpand-1 '(say-hello blah))                  
-> blah

Is that because it evaluated println and "Hello" at expand time and then 'blah' 
was the only thing it didn't know what to do with?