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A //go:debug line mentioning an unknown or retired setting should be diagnosed as making the program invalid. Do that. We agreed on this in the proposal but I forgot to implement it. Change-Id: Ie69072a1682d4eeb6866c02adbbb426f608567c4 Reviewed-on: https://go-review.googlesource.com/c/go/+/476280 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Bryan Mills <bcmills@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>