mruby/mruby — pull request #1983 by ksss (2014-03-31 00:01:34+00:00)
Title: Add outer class for fix inner singleton class

That code raise NameError.

```ruby
module Mod
module InnerModule
end
class InnerClass
end
class << self
InnerModule #=> NameError
InnerClass #=> NameError
end
end
```

This reason was that singleton class object can't find outer class for iv `__outer__` was nothing.