Error when trying to use with elixir

[timuckun]

Hi. I am trying to use this with elixir. I have copied the code in your readme and translated it to elixir the gist is here https://gist.github.com/timuckun/4fb72215a7d745a8ea9be54302f20ae3#file-gistfile1-txt

I get the following error

Compiling 1 file (.ex)

== Compilation error on file lib/lmdb_test.ex ==
** (MatchError) no match of right hand side value: :exists
lib/lmdb_test.ex:17: (module)
(stdlib) erl_eval.erl:670: :erl_eval.do_apply/6

I am pretty new to both erlang and elixir so I am not sure if this is my doing or if something is wrong but if you can help me out I'd appreciate it.

Thanks.