dirstate.invalidate: avoid rebuilding _map
Since hasattr will call __getattr__, the call to hasattr(self, '_dirs')
will end up reparsing the dirstate file.
abort: repository a not found!
255
abort: error: Connection refused
255
abort: repository a not found!
255
abort: destination '../a' already exists
255
abort: repository a not found!
255
destination directory: q
abort: destination 'q' already exists