Back when Go 1.20 and 1.19 were supported, the go1.20 build constraint was there to establish 1.20 as the minimum for the package, because it requires an API that was added only in Go 1.20 and there was no way to make it work with 1.19's APIs. By now only Go 1.24 and 1.23 are supported, and the minimum is set via the go directive in go.mod. For golang/go#57792. Change-Id: Ie4d37d34993374cdd380667930ee667af97eeccb Reviewed-on: https://go-review.googlesource.com/c/crypto/+/649716 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Roland Shoemaker <roland@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>