"I don't think that word means what you think it means" 😂

Without the argument or a local variable, these references are invoking
Kernel.node/0
http://elixir-lang.org/docs/stable/elixir/Kernel.html#node/0

lib/blanks.ex

@@ -32,8 +32,8 @@ defmodule Blanks do
     |> elem(1)
   end
 
-  defp count(:___, acc), do: {node, acc+1}
-  defp count({:___, _, _}, acc), do: {node, acc+1}
+  defp count(:___ = node, acc), do: {node, acc+1}
+  defp count({:___, _, _} = node, acc), do: {node, acc+1}
   defp count(node, acc), do: {node, acc}
 
   def replace_line([do: ast], replacement_fn), do: [do: replace_line(ast, replacement_fn)]