gistfile1.txt

  defp string_escape(<<?u, a1, b1, c1, d1, "\\u", a2, b2, c2, d2>> <> rest, acc)
    when a1 in 'dD' and a2 in 'dD'
    and (b1 in '89abAB')
    and (b2 in ?c..?f or b2 in ?C..?F) \
  do
    hi = List.to_integer([a1, b1, c1, d1], 16)
    lo = List.to_integer([a2, b2, c2, d2], 16)
    codepoint = 0x10000 + ((hi &&& 0x03FF) <<< 10) + (lo &&& 0x03FF)
    string_continue(rest, [acc, <<codepoint :: utf8>>])
  end
  
---

== Compilation error on file lib/poison.ex ==
** (CompileError) lib/poison.ex:37: function '&&&'/2 undefined
    (stdlib) lists.erl:1336: :lists.foreach/2
    (stdlib) erl_eval.erl:657: :erl_eval.do_apply/6