shadowing.ex

> defmodule M do
>  def f do
>   x = 0
>   {fn -> x = 1 end, fn -> x end}
>  end
> end
iex:4: warning: variable x is unused
{:module, M,
 <<70, 79, 82, 49, 0, 0, 5, 24, 66, 69, 65, 77, 69, 120, 68, 99, 0, 0, 0, 124, 131, 104, 2, 100, 0, 14, 101, 108, 105, 120, 105, 114, 95, 100, 111, 99, 115, 95, 118, 49, 108, 0, 0, 0, 4, 104, 2, ...>>,
 {:f, 0}}
> {g, h} = M.f
{#Function<0.66867849/0 in M.f/0>, #Function<1.66867849/0 in M.f/0>}
> h.()
0
> g.()
1
> h.()
0
>