diff --git a/actionpack/lib/action_controller/metal/helpers.rb b/actionpack/lib/action_controller/metal/helpers.rb
index d0402e5bad..cdd14560e1 100644
--- a/actionpack/lib/action_controller/metal/helpers.rb
+++ b/actionpack/lib/action_controller/metal/helpers.rb
@@ -100,7 +100,7 @@ module ActionController
         module_path = module_name.underscore
         helper module_path
       rescue MissingSourceFile => e
-        raise e unless e.is_missing? "#{module_path}_helper"
+        raise e unless e.is_missing? "helpers/#{module_path}_helper"
       rescue NameError => e
         raise e unless e.missing_name? "#{module_name}Helper"
       end
diff --git a/actionpack/test/controller/new_base/base_test.rb b/actionpack/test/controller/new_base/base_test.rb
index 579f9f349f..0b40f8ce95 100644
--- a/actionpack/test/controller/new_base/base_test.rb
+++ b/actionpack/test/controller/new_base/base_test.rb
@@ -22,7 +22,7 @@ module Dispatching
     end
 
     def show_actions
-      render :text => "actions: #{action_methods.to_a.join(', ')}"
+      render :text => "actions: #{action_methods.to_a.sort.join(', ')}"
     end
 
     protected
diff --git a/activemodel/lib/active_model/lint.rb b/activemodel/lib/active_model/lint.rb
index 0be82aa180..1330bf7042 100644
--- a/activemodel/lib/active_model/lint.rb
+++ b/activemodel/lib/active_model/lint.rb
@@ -53,6 +53,8 @@ module ActiveModel
         assert_kind_of String, model_name
         assert_kind_of String, model_name.human
         assert_kind_of String, model_name.partial_path
+        assert_kind_of String, model_name.singular
+        assert_kind_of String, model_name.plural
       end
 
       # errors
diff --git a/activesupport/lib/active_support/core_ext/load_error.rb b/activesupport/lib/active_support/core_ext/load_error.rb
index cc6287b100..615ebe9588 100644
--- a/activesupport/lib/active_support/core_ext/load_error.rb
+++ b/activesupport/lib/active_support/core_ext/load_error.rb
@@ -1,36 +1,22 @@
-class MissingSourceFile < LoadError #:nodoc:
-  attr_reader :path
-  def initialize(message, path)
-    super(message)
-    @path = path
-  end
-
-  def is_missing?(path)
-    path.gsub(/\.rb$/, '') == self.path.gsub(/\.rb$/, '')
-  end
-
-  def self.from_message(message)
-    REGEXPS.each do |regexp, capture|
-      match = regexp.match(message)
-      return MissingSourceFile.new(message, match[capture]) unless match.nil?
-    end
-    nil
-  end
-
-  REGEXPS = [
-    [/^no such file to load -- (.+)$/i, 1],
-    [/^Missing \w+ (file\s*)?([^\s]+.rb)$/i, 2],
-    [/^Missing API definition file in (.+)$/i, 1],
-    [/win32/, 0]
-  ] unless defined?(REGEXPS)
-end
-
 class LoadError
-  def self.new(*args)
-    if self == LoadError
-      MissingSourceFile.from_message(args.first)
-    else
-      super
+  REGEXPS = [
+    /^no such file to load -- (.+)$/i,
+    /^Missing \w+ (?:file\s*)?([^\s]+.rb)$/i,
+    /^Missing API definition file in (.+)$/i,
+  ]
+
+  def path
+    @path ||= begin
+      REGEXPS.find do |regex|
+        message =~ regex
+      end
+      $1
     end
   end
+
+  def is_missing?(location)
+    location.sub(/\.rb$/, '') == path.sub(/\.rb$/, '')
+  end
 end
+
+MissingSourceFile = LoadError
\ No newline at end of file
diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb
index e858bcdc80..8ded9f8b2d 100644
--- a/activesupport/lib/active_support/dependencies.rb
+++ b/activesupport/lib/active_support/dependencies.rb
@@ -236,7 +236,7 @@ module ActiveSupport #:nodoc:
     rescue LoadError => load_error
       unless swallow_load_errors
         if file_name = load_error.message[/ -- (.*?)(\.rb)?$/, 1]
-          raise MissingSourceFile.new(message % file_name, load_error.path).copy_blame!(load_error)
+          raise LoadError.new(message % file_name).copy_blame!(load_error)
         end
         raise
       end
diff --git a/activesupport/test/core_ext/load_error_test.rb b/activesupport/test/core_ext/load_error_test.rb
index b775b65f9f..d7b8f602ca 100644
--- a/activesupport/test/core_ext/load_error_test.rb
+++ b/activesupport/test/core_ext/load_error_test.rb
@@ -15,3 +15,18 @@ class TestMissingSourceFile < Test::Unit::TestCase
     end
   end
 end
+
+class TestLoadError < Test::Unit::TestCase
+  def test_with_require
+    assert_raise(LoadError) { require 'no_this_file_don\'t_exist' }
+  end
+  def test_with_load
+    assert_raise(LoadError) { load 'nor_does_this_one' }
+  end
+  def test_path
+    begin load 'nor/this/one.rb'
+    rescue LoadError => e
+      assert_equal 'nor/this/one.rb', e.path
+    end
+  end
+end
\ No newline at end of file