Improve Kernel.Def
Improve Kernel.Def

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