Dependency postgrex 0.5.5 conflicts with Elixir 1.0.0

[dmuso]

Working through the Getting Started tl;dr steps:

# Create your new project
mix new your_project
cd your_project

# Add '{:sugar, github: "sugar-framework/sugar"}'
# to your deps
vi mix.exs

# Get dependencies and compile them
mix do deps.get, deps.compile

Output:

Generated plug.app
==> plugs
Compiled lib/sugar/plugs/parsers/json.ex
Compiled lib/sugar/plugs/hot_code_reload.ex
Compiled lib/sugar/plugs/exceptions.ex
lib/sugar/plugs/logger.ex:1: warning: behaviour Plug.Wrapper undefined
Compiled lib/sugar/plugs/logger.ex
Generated plugs.app
==> postgrex
warning: the dependency postgrex requires Elixir "~> 0.15.0" but you are running on v1.0.0
Compiled lib/postgrex/binary_utils.ex
Compiled lib/postgrex/error.ex
Compiled lib/postgrex/structs.ex
lib/postgrex/types.ex:5: warning: unused import Postgrex.BinaryUtils

== Compilation error on file lib/postgrex/types.ex ==
** (CompileError) lib/postgrex/types.ex:97: cannot invoke local nil?/1 inside guard
    (stdlib) lists.erl:1352: :lists.mapfoldl/3
    (elixir) src/elixir_clauses.erl:53: :elixir_clauses.translate_guard/4
    (elixir) src/elixir_clauses.erl:49: :elixir_clauses."-guards/4-lc$^0/1-0-"/4
    (elixir) src/elixir_clauses.erl:39: :elixir_clauses.clause/7
    (elixir) src/elixir_clauses.erl:82: anonymous fn/5 in :elixir_clauses.do_clauses/4
    (elixir) src/elixir.erl:175: :elixir.erl_eval/3

could not compile dependency postgrex, mix compile failed. You can recompile this dependency with `mix deps.compile postgrex` or update it with `mix deps.update postgrex`

Adding { :postgrex, "~> 0.6.0" } to the mix.exs deps section gets a clean get/compile cycle. To run mix sugar.init however, it required me to also update deps/sugar/mix.exs with the upgraded postgrex version.

I have no idea if this workaround can be plugged straight in as I've only recently started learning Elixir and know next to nothing :) mix server did successfully start and I could get a "hello world" from the server, so it's working so far.

[dmuso]

Pull request created:

https://github.com/sugar-framework/sugar/pull/47

[slogsdon]

@dmuso, Thanks for reporting this. #45 was just merged into master and takes care of this dependency issue.