Get rid of exceptions/ folder.

lib/vagrant/action.rb

@@ -46,7 +46,7 @@ module Vagrant
     def run(callable, options=nil)
       callable = Builder.new.use(callable) if callable.kind_of?(Class)
       callable = self.class.actions[callable] if callable.kind_of?(Symbol)
-      raise Exceptions::UncallableAction.new(callable) if !callable
+      raise ArgumentError.new("Argument to run must be a callable object or registered action.") if !callable
 
       action_environment = Action::Environment.new(env)
       action_environment.merge!(options || {})

lib/vagrant/exceptions/uncallable_action.rb

@@ -1,17 +0,0 @@
-module Vagrant
-  module Exceptions
-    # Raised when an action sequence is trying to be run for an uncallable
-    # action (not a lambda, middleware, or registered sequence).
-    class UncallableAction < ::Exception
-      def initialize(callable)
-        super()
-
-        @callable = callable
-      end
-
-      def to_s
-        @callable.inspect
-      end
-    end
-  end
-end

test/vagrant/action_test.rb

@@ -32,8 +32,8 @@ class ActionTest < Test::Unit::TestCase
     end
 
     should "raise an exception if a nil action is given" do
-      assert_raises(Vagrant::Exceptions::UncallableAction) { @instance.run(nil) }
-      assert_raises(Vagrant::Exceptions::UncallableAction) { @instance.run(:dontexist) }
+      assert_raises(ArgumentError) { @instance.run(nil) }
+      assert_raises(ArgumentError) { @instance.run(:dontexist) }
     end
 
     should "run the callable item with the proper context" do