expm server command fails

[sheerun]

I'm not even sure what it does, but certainly error message could be better:

expm server
** (CaseClauseError) no case clause matching: true
    /home/expm/expm/lib/cli.ex:72: Expm.CLI.run/2
    /home/expm/elixir/lib/elixir/lib/kernel/cli.ex:39: Kernel.CLI.run/2
    escript.erl:747: :escript.run/2
    escript.erl:277: :escript.start/1
    :init.start_it/1
    :init.start_em/1

OSX 10.9, Elixir 0.12.3, Erlang R16B03 (erts-5.10.4)