add a test for [ruby-dev:33072].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15470 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/test_knownbug.rb

@@ -45,3 +45,7 @@ assert_equal 'ok', %q{
 }, '[ruby-core:14537]'
 
 assert_valid_syntax('1.times {|i|print (42),1;}', '[ruby-list:44479]')
+
+assert_normal_exit %q{
+  File.read("empty", nil, nil, {})
+}, '[ruby-dev:33072]'