I think I might have found a bug with how namespaces are handled. The maintainer of the relevant project (Openplanet) suggested I report it here.

My understanding is that this should work:

class DictOfChallenge_WriteLog : _DictOfChallenge_WriteLog::DictOfChallenge_WriteLog {}
namespace _DictOfChallenge_WriteLog {
  class DictOfChallenge_WriteLog {}
}
namespace DictOfChallenge_WriteLog {
  class KvPair : _KvPair::KvPair {}
  namespace _KvPair {
    class KvPair {}
  }
}

I get a compilation error though:
ERR: Namespace '_KvPair' doesn't exist

(Note: it doesn't matter if class KvPair : _KvPair::KvPair {} is declared before or after the _KvPair namespace)

If anyone is curious about the class/NS names and why anything would be structured like this, I'm writing a code generator (code: https://github.com/XertroV/op-as-codegen/​ ) to provide an experience that's closer to higher level languages but which can't be done in angelscript. (there's some up-to-date sample generated code in the ./codegen folder)​