Warnings for switch statements with just a default case are now fatal with the latest Windows toolchain used by Github workflows. So indirectly this was breaking Conscrypt's continuous integration and possibly other projects using BoringSSL which run CI on Windows. Example: https://github.com/google/conscrypt/runs/793502854?check_suite_focus=true Change-Id: Ia09b86f3292299089c6536862a170677a8024984 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41844 Commit-Queue: David Benjamin <davidben@google.com> Reviewed-by: David Benjamin <davidben@google.com>