In general there is very little overlap. crypto/rand vs math/rand don't even overlap except for rand.Read, and that was a mistake. We also corrected the import

In general there is very little overlap. crypto/rand vs math/rand don't even overlap except for rand.Read, and that was a mistake. We also corrected the import fixer in 2016 to prefer crypto/rand, so no one should have run into this problem in a very long time. https://go-review.googlesource.com/24847 https://go-review.googlesource.com/24847