Tidy up implementation for warning on @attribute redefinition
Tidy up implementation for warning on @attribute redefinition

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