Calling a block passed in a macro in Elixir

block.ex

defmodule Foo do
  defmacro foo(do: block) do
    quote do
      res = unquote(block)
      IO.inspect(res)
    end
  end
end

defmodule Use do
  require Foo

  def test() do
    Foo.foo do
      1 + 2
    end
  end
end

# $ elixir test.exs
# 3
Use.test()