Elixir macro to bind variables inside pipes (experimental)

bind_in_pipes.ex

defmodule BindInPipes do
  defmacro bind(state, variable) do
    ast = quote do
      {:__block__, [], [
        {:=, [], [{:var!, [context: Elixir, import: Kernel], [{unquote(variable), [], Elixir}]}, unquote(state)]},
        unquote(state)
      ]}
    end
    {result, []} = Code.eval_quoted(ast, [], __ENV__)
    result
  end
end