Fix IEx parser fetching on mix release

Author: josevalim

lib/iex/lib/iex/config.ex

@@ -80,7 +80,9 @@ defmodule IEx.Config do
   end
 
   def parser() do
-    Application.fetch_env!(:iex, :parser)
+    # Since the parser itself can be invoked from the remote node
+    # without IEx running, we cannot use fetch_env!
+    Application.get_env(:iex, :parser, {IEx.Evaluator, :parse, []})
   end
 
   def color(color) do

lib/iex/mix.exs

@@ -19,7 +19,6 @@ defmodule IEx.MixProject do
       mod: {IEx.App, []},
       env: [
         colors: [],
-        parser: {IEx.Evaluator, :parse, []},
         inspect: [pretty: true],
         history_size: 20,
         default_prompt: "%prefix(%counter)>",