Avoid non-fixed table errors on autocomplete

Author: José Valim

lib/iex/lib/iex/autocomplete.ex

@@ -177,13 +177,17 @@ defmodule IEx.Autocomplete do
   end
 
   defp get_modules_from_applications do
-    for {app, _, _} <- :application.loaded_applications(),
+    for [app] <- loaded_applications(),
         {_, modules} = :application.get_key(app, :modules),
         module <- modules do
       Atom.to_string(module)
     end
   end
 
+  defp loaded_applications do
+    :ets.match(:ac_tab, {{:loaded, :"$1"}, :_})
+  end
+
   defp match_module_funs(mod, hint) do
     case ensure_loaded(mod) do
       {:module, _} ->