Would've caught two regressions so far, and found two more.

Updates #24841
Updates #24845 (package net remains)

Change-Id: I57ad06eb54e04b8c99b5d2e7f24c77ad865224e8
Reviewed-on: https://go-review.googlesource.com/107300Reviewed-by: Ian Lance Taylor <iant@golang.org>