// or an appropriate base for a pseudo-version.
	var (
		highestCanonical string
		pseudoBase       string
	)
	for _, pathTag := range info.Tags {
		v, tagIsCanonical := tagToVersion(pathTag)
		if statVers != "" && semver.Compare(v, statVers) == 0 {
			// The tag is equivalent to the version requested by the user.
			if tagIsCanonical {

func importPathOK(r rune) bool {
	return modPathOK(r) || r == '+'
}

// fileNameOK reports whether r can appear in a file name.
// For now we allow all Unicode letters but otherwise limit to pathOK plus a few more punctuation characters.
// If we expand the set of allowed characters here, we have to
// work harder at detecting potential case-folding and normalization collisions.
// See note about "escaped paths" above.