mongodb/mongo-ruby-driver — pull request #179 by brandonblack (2013-03-28 18:45:16+00:00)
Title: RUBY-572 fixing call to checkout_reader in DB#authenticate

The interface for MongoReplicaSetClient#checkout_reader was changed recently
in RUBY-475. This usage of checkout_reader was missed and currently calls to
DB#authenticate raise an exception.