eval("\"\xfd".force_encoding("utf-8")) generates garbage in error message.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14076 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/test_knownbug.rb

@@ -9,3 +9,8 @@ assert_equal '0', %q{
   Process.wait pid
   $?.to_i
 }, '[ruby-dev:32404]'
+
+assert_match /unterminated string meets end of file/, %q{
+  STDERR.reopen(STDOUT)
+  eval("\"\xfd".force_encoding("utf-8"))
+}