(1) master の該当の差分を探しておく
$ git log|head -15
commit e4ce857d53544c2f9c3a81c5fcf4b7c7dc4bb6ce
Author: Raphaël Simon <[email protected]>
Date: Sun Apr 2 18:01:16 2017 -0700
Update generated file headers to match new Go standard (#1160)
as described in https://github.com/golang/go/issues/13560