Non-release versions that are built from source without a VERSION file specifying any particular version end up with a development version like "devel go1.25-67e0681aef Thu Apr 24 12:17:27 2025 -0700". Right now those versions are correctly determined to be non-release because they don't have a "go" prefix, instead they have a "devel " prefix. In preparation of being able to move the "devel" substring, add a check that said substring isn't present anywhere, since it is certain not to be included in any released Go version we publish at https://go.dev/dl/. For #73372. Change-Id: Ia3e0d03b5723d4034d6270c3a2224f8dfae380e9 Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest Reviewed-on: https://go-review.googlesource.com/c/go/+/667955 Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Michael Pratt <mpratt@google.com>
The Go Programming Language
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