// we can re-use the Go version here.
	if IsToolchainProgram(progPath) {
		progVers = goVers
	} else {
		progVers = info.Main.Version
		if strings.Contains(progVers, "devel") || module.IsPseudoVersion(progVers) {
			// We don't want to track pseudo versions, but may want to track prereleases.
			progVers = "devel"
		}
	}

	return goVers, progPath, progVers

		return ""
	}
	if i == 0 && digits[i] == '1' && len(digits) > 1 {
		digits = digits[1:]
	} else {
		digits[i]--
	}
	return string(digits)
}

// IsPseudoVersion reports whether v is a pseudo-version.
func IsPseudoVersion(v string) bool {
	return strings.Count(v, "-") >= 2 && semver.IsValid(v) && pseudoVersionRE.MatchString(v)
}

// IsZeroPseudoVersion returns whether v is a pseudo-version with a zero base,

	if version != "" && version != module.CanonicalVersion(version) {
		return &module.ModuleError{
			Path: p.path,
			Err: &module.InvalidVersionError{
				Version: version,
				Pseudo:  module.IsPseudoVersion(version),
				Err:     err,
			},
		}
	}

	return &module.ModuleError{
		Path:    p.path,
		Version: version,
		Err:     err,
	}
}

		// Otherwise, use the latest pseudoversion.
		var latestRelease, latestPrerelease, latestPseudo string
		for _, m := range modList {
			if m.Path != modPath {
				continue
			}
			if module.IsPseudoVersion(m.Version) && (latestPseudo == "" || semver.Compare(latestPseudo, m.Version) > 0) {
				latestPseudo = m.Version

			// would not resolve at all. (The Go version string "v2.0.0+incompatible"
			// refers to the "v2.0.0" version tag, which we handle below.)
			continue
		}
		if module.IsPseudoVersion(v) {
			// Ignore tags that look like pseudo-versions: Stat rewrites those
			// unambiguously to the underlying commit, and tagToVersion drops them.
			continue
		}

		} else {
			qm.mayUseLatest = module.IsPseudoVersion(current)
			qm.filter = func(mv string) bool { return gover.ModCompare(qm.path, mv, current) >= 0 }
		}

	case query == "patch":
		if current == "" || current == "none" {
			return nil, &NoPatchBaseError{path}
		}
		if current == "" {
			qm.mayUseLatest = true
		} else {
			qm.mayUseLatest = module.IsPseudoVersion(current)

	var maxVersion string
	suffix := "-" + rev + ".info"
	err = errNotCached
	for _, name := range names {
		if strings.HasSuffix(name, suffix) {
			v := strings.TrimSuffix(name, ".info")
			if module.IsPseudoVersion(v) && semver.Compare(v, maxVersion) > 0 {
				maxVersion = v
				file, info, err = readDiskStat(ctx, path, strings.TrimSuffix(name, ".info"))
			}
		}
	}
	return file, info, err
}

	// but tags of this form being created should be fairly rare
	// (and invalidate pseudo-version results anyway).
	c := semver.Canonical(tag)
	return c != "" && strings.HasPrefix(tag, c) && !module.IsPseudoVersion(tag)
}

// A RevInfo describes a single revision in a source code repository.
type RevInfo struct {
	Origin  *Origin
	Name    string    // complete ID in underlying repository