Add a couple of tests for errors with in/2 in guards
Add a couple of tests for errors with in/2 in guards

ggcampinho/elixir,beedub/elixir,kelvinst/elixir,beedub/elixir,elixir-lang/elixir,kimshrier/elixir,kelvinst/elixir,ggcampinho/elixir,michalmuskala/elixir,lexmag/elixir,pedrosnk/elixir,joshprice/elixir,kimshrier/elixir,antipax/elixir,pedrosnk/elixir,lexmag/elixir,gfvcastro/elixir,gfvcastro/elixir,antipax/elixir