Do not allow templates coming from Fallback resolvers to store a virtual path.

actionpack/lib/action_view.rb

@@ -57,6 +57,7 @@ module ActionView
       autoload :Resolver
       autoload :PathResolver
       autoload :FileSystemResolver
+      autoload :FallbackFileSystemResolver
     end
 
     autoload_at "action_view/template/error" do

actionpack/lib/action_view/lookup_context.rb

@@ -10,7 +10,7 @@ module ActionView
   # this key is generated just once during the request, it speeds up all cache accesses.
   class LookupContext #:nodoc:
     mattr_accessor :fallbacks
-    @@fallbacks = [FileSystemResolver.new(""), FileSystemResolver.new("/")]
+    @@fallbacks = FallbackFileSystemResolver.instances
 
     mattr_accessor :registered_details
     self.registered_details = []

actionpack/lib/action_view/template/resolver.rb

@@ -135,6 +135,7 @@ module ActionView
     end
   end
 
+  # A resolver that loads files from the filesystem.
   class FileSystemResolver < PathResolver
     def initialize(path)
       raise ArgumentError, "path already is a Resolver class" if path.is_a?(Resolver)
@@ -152,4 +153,16 @@ module ActionView
     end
     alias :== :eql?
   end
+
+  # The same as FileSystemResolver but does not allow templates to store
+  # a virtual path since it is invalid for such resolvers.
+  class FallbackFileSystemResolver < FileSystemResolver
+    def self.instances
+      [new(""), new("/")]
+    end
+
+    def decorate(*)
+      super.each { |t| t.virtual_path = nil }
+    end
+  end
 end

actionpack/test/template/lookup_context_test.rb

@@ -100,8 +100,8 @@ class LookupContextTest < ActiveSupport::TestCase
 
     @lookup_context.with_fallbacks do
       assert_equal 3, @lookup_context.view_paths.size
-      assert @lookup_context.view_paths.include?(ActionView::FileSystemResolver.new(""))
-      assert @lookup_context.view_paths.include?(ActionView::FileSystemResolver.new("/"))
+      assert @lookup_context.view_paths.include?(ActionView::FallbackFileSystemResolver.new(""))
+      assert @lookup_context.view_paths.include?(ActionView::FallbackFileSystemResolver.new("/"))
     end
   end
 

actionpack/test/template/render_test.rb

@@ -114,7 +114,7 @@ module RenderTestCases
   end
 
   def test_render_sub_template_with_errors
-    @view.render(:file => "test/sub_template_raise")
+    @view.render(:template => "test/sub_template_raise")
     flunk "Render did not raise Template::Error"
   rescue ActionView::Template::Error => e
     assert_match %r!method.*doesnt_exist!, e.message
@@ -123,6 +123,17 @@ module RenderTestCases
     assert_equal File.expand_path("#{FIXTURE_LOAD_PATH}/test/_raise.html.erb"), e.file_name
   end
 
+  def test_render_file_with_errors
+    @view.render(:file => File.expand_path("test/_raise", FIXTURE_LOAD_PATH))
+    flunk "Render did not raise Template::Error"
+  rescue ActionView::Template::Error => e
+    assert_match %r!method.*doesnt_exist!, e.message
+    assert_equal "", e.sub_template_message
+    assert_equal "1", e.line_number
+    assert_equal "1: <%= doesnt_exist %>", e.annoted_source_code.strip
+    assert_equal File.expand_path("#{FIXTURE_LOAD_PATH}/test/_raise.html.erb"), e.file_name
+  end
+
   def test_render_object
     assert_equal "Hello: david", @view.render(:partial => "test/customer", :object => Customer.new("david"))
   end