Improve naming of errors in elixir_expand
Improve naming of errors in elixir_expand

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