*IEX*.txt

iex(1)> expr = quote do: Unless.macro_unless(true, IO.puts "this should never be printed")
{{:., [], [{:__aliases__, [alias: false], [:Unless]}, :macro_unless]}, [],
 [true,
  {{:., [], [{:__aliases__, [alias: false], [:IO]}, :puts]}, [],
   ["this should never be printed"]}]}
iex(2)> res  = Macro.expand_once(expr, __ENV__)
{{:., [], [{:__aliases__, [alias: false], [:Unless]}, :macro_unless]}, [],
 [true,
  {{:., [], [{:__aliases__, [alias: false], [:IO]}, :puts]}, [],
   ["this should never be printed"]}]}
iex(3)> IO.puts Macro.to_string(res)
Unless.macro_unless(true, IO.puts("this should never be printed"))
:ok
iex(4)> res  = Macro.expand(expr, __ENV__)
{{:., [], [{:__aliases__, [alias: false], [:Unless]}, :macro_unless]}, [],
 [true,
  {{:., [], [{:__aliases__, [alias: false], [:IO]}, :puts]}, [],
   ["this should never be printed"]}]}
iex(5)> IO.puts Macro.to_string(res)
Unless.macro_unless(true, IO.puts("this should never be printed"))
:ok