Spotted with Gordon Klass's `ineffassign`
% ineffassign ~/src/github.com/juju/juju
/home/dfc/src/github.com/juju/juju/api/agent/unit_test.go:36:2 err
/home/dfc/src/github.com/juju/juju/apiserver/admin_test.go:265:2 connectedAddr
/home/dfc/src/github.com/juju/juju/apiserver/client/client_test.go:3220:2 err
/home/dfc/src/github.com/juju/juju/apiserver/client/client_test.go:2239:8 err
/home/dfc/src/github.com/juju/juju/apiserver/highavailability/highavailability_test.go:291:12 err
/home/dfc/src/github.com/juju/juju/apiserver/service/service_test.go:179:2 settings
/home/dfc/src/github.com/juju/juju/apiserver/uniter/uniter_base_test.go:2257:2 err
/home/dfc/src/github.com/juju/juju/cloudconfig/sshinit/configure.go:59:3 client
/home/dfc/src/github.com/juju/juju/cmd/juju/service/constraints.go:82:17 args
/home/dfc/src/github.com/juju/juju/environs/tools/simplestreams_test.go:829:7 err
/home/dfc/src/github.com/juju/juju/instance/container_test.go:35:2 ctype
/home/dfc/src/github.com/juju/juju/instance/container_test.go:52:2 ctype
/home/dfc/src/github.com/juju/juju/provider/cloudsigma/instance_test.go:98:9 err
/home/dfc/src/github.com/juju/juju/provider/ec2/environ.go:152:4 defaultVpcId
/home/dfc/src/github.com/juju/juju/provider/gce/google/errors.go:65:4 msg
/home/dfc/src/github.com/juju/juju/state/backups/db_restore_test.go:56:2 args
/home/dfc/src/github.com/juju/juju/state/status_test.go:57:11 err
/home/dfc/src/github.com/juju/juju/state/watcher/watcher_test.go:500:2 revno3
/home/dfc/src/github.com/juju/juju/worker/uniter/filter/filter_test.go:288:2 err
/home/dfc/src/github.com/juju/juju/worker/uniter/util_test.go:1282:2 meta
