Config JSON doesn't include 'env'

lib/vagrant/config.rb

@@ -51,7 +51,7 @@ module Vagrant
 
       def instance_variables_hash
         instance_variables.inject({}) do |acc, iv|
-          acc[iv.to_s[1..-1].to_sym] = instance_variable_get(iv)
+          acc[iv.to_s[1..-1].to_sym] = instance_variable_get(iv) unless iv.to_sym == :@env
           acc
         end
       end

test/vagrant/config_test.rb

@@ -128,6 +128,12 @@ class ConfigTest < Test::Unit::TestCase
       @base.expects(:instance_variables_hash).returns(@iv_hash)
       assert_equal @json, @base.to_json
     end
+
+    should "not include env in the JSON hash" do
+      @base.env = "FOO"
+      hash = @base.instance_variables_hash
+      assert !hash.has_key?(:env)
+    end
   end
 
   context "top config class" do