https://go-review.googlesource.com/#/c/11822/3/event/event.go removed the fmt package dependency, but concurrently, https://go-review.googlesource.com/#/c/11813/2/event/event.go introduced new code that relied on fmt already being imported. Change-Id: Ib5c66bf59850aa49d251778371c4863bfdf54655 Reviewed-on: https://go-review.googlesource.com/11859 Reviewed-by: Nigel Tao <nigeltao@golang.org>