stdout '"Version": "latest"'
stdout '"Error":.*no matching versions'
! stdout '"TagPrefix"'
stdout '"TagSum": "t1:47DEQpj8HBSa[+]/TImW[+]5JCeuQeRkm5NMpJWZG3hSuFU="'
stdout '"Ref": "HEAD"'
stdout '"Hash": "fc3a09f3dc5cfe0d7a743ea18f1f5226e68b3777"'
! stdout 'RepoSum'

# go mod download vcstest/hello/sub/v9 should also fail, print origin info with TagPrefix
! go mod download -x -json vcs-test.golang.org/git/hello.git/sub/v9@latest

cp stdout has-nested.json
stdout '"Origin":'
stdout '"VCS": "git"'
stdout '"URL":'  # randomly-chosen vcweb localhost URL
stdout '"Subdir": "nested"'
stdout '"TagPrefix": "nested/"'
stdout '"TagSum": "t1:47DEQpj8HBSa\+/TImW\+5JCeuQeRkm5NMpJWZG3hSuFU="'
stdout '"Ref": "refs/tags/has-nested"'
stdout '"Hash": "08a4fa6bb9c04ffba03b26ae427b0d6335d90a2a"'

			return nil
		}
		merged.Hash = m2.Hash
	}
	if m2.TagSum != "" {
		if m1.TagSum != "" && (m1.TagSum != m2.TagSum || m1.TagPrefix != m2.TagPrefix) {
			return nil
		}
		merged.TagSum = m2.TagSum
		merged.TagPrefix = m2.TagPrefix
	}
	if m2.Ref != "" {
		if m1.Ref != "" && m1.Ref != m2.Ref {
			return nil
		}
		merged.Ref = m2.Ref
	}

	switch {

	// Tag must have a prefix matching codeDir.
	tagPrefix := ""
	if r.codeDir != "" {
		tagPrefix = r.codeDir + "/"
	}

	isRetracted, err := r.retractedVersions(ctx)
	if err != nil {
		isRetracted = func(string) bool { return false }
	}

	// tagToVersion returns the version obtained by trimming tagPrefix from tag.
	// If the tag is invalid, retracted, or a pseudo-version, tagToVersion returns

	// depends on the set of tags present in the repo, specifically the tags
	// of the form TagPrefix + a valid semver version.
	// If the matching repo tags and their commit hashes still hash to TagSum,
	// the Origin is still valid (at least as far as the tags are concerned).
	// The exact checksum is up to the Repo implementation; see (*gitRepo).Tags.
	TagPrefix string `json:",omitempty"`
	TagSum    string `json:",omitempty"`

		}
		if hash != old.Hash {
			return fmt.Errorf("ref %q moved from %s to %s", old.Ref, old.Hash, hash)
		}
	}
	if old.TagSum != "" {
		tags, err := r.Tags(ctx, old.TagPrefix)
		if err != nil {
			return err
		}
		if tags.Origin.TagSum != old.TagSum {
			return fmt.Errorf("tags changed")
		}
	}
	if old.RepoSum != "" {
		if r.repoSum(r.refs) != old.RepoSum {

		info = &clean
		o := *info.Origin
		info.Origin = &o

		// Tags never matter if you are starting with a semver version,
		// as we would be when finding this cache entry.
		o.TagSum = ""
		o.TagPrefix = ""
		// Ref doesn't matter if you have a pseudoversion.
		if module.IsPseudoVersion(info.Version) {
			o.Ref = ""
		}
	}

	js, err := json.Marshal(info)
	if err != nil {
		return err
	}