defmodule Fizz do
  defmacro asdf, do: IO.puts("asdf")
end

defmodule Buzz do
  require Fizz
  Fizz.asdf
end

defmodule Fizz do
  # ...
  defmacro asdf_qwer, do: asdf && IO.puts("qwer")
end

defmodule Fizz do
  defmacro asdf, do: IO.puts("asdf")
  asdf
end