const internal/goversion.Version

3 uses

	internal/goversion (current package)
		goversion.go#L12: const Version = 24

	go/build
		build.go#L354: 	for i := 1; i <= goversion.Version; i++ {

	go/types
		version.go#L48: 	go_current = asGoVersion(fmt.Sprintf("go1.%d", goversion.Version))