merges r23286 from trunk into ruby_1_9_1.

--
* lib/optparse.rb (OptionParser#parse_in_order): do not make an
  option from non-option argument.  [ruby-dev:38333]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@23396 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/optparse/test_optparse.rb

@@ -8,6 +8,8 @@ class TestOptionParser < Test::Unit::TestCase
   end
   def no_error(*args)
     assert_nothing_raised(*args) {return yield}
+  ensure
+    $!.backtrace.delete_if {|e| /\A#{Regexp.quote(__FILE__)}:#{__LINE__-2}/o =~ e} if $!
   end
 
   def test_permute