if codeRoot != path {
		if !hasPathPrefix(pathPrefix, codeRoot) {
			return nil, fmt.Errorf("repository rooted at %s cannot contain module %s", codeRoot, path)
		}
		codeDir = strings.Trim(pathPrefix[len(codeRoot):], "/")
	}

	r := &codeRepo{
		modPath:     path,
		code:        code,
		codeRoot:    codeRoot,
		codeDir:     codeDir,
		pathPrefix:  pathPrefix,
		pathMajor:   pathMajor,

		}
	}

	if cfg.BuildMod == "vendor" {
		for _, mod := range MainModules.Versions() {
			if modRoot := MainModules.ModRoot(mod); modRoot != "" {
				walkPkgs(modRoot, MainModules.PathPrefix(mod), pruneGoMod|pruneVendor)
			}
		}
		if HasModRoot() {
			walkPkgs(VendorDir(), "", pruneVendor)
		}
		return
	}

	for _, mod := range modules {

	}
	for _, srv := range vcsPaths {
		if !str.HasPathPrefix(importPath, srv.pathPrefix) {
			continue
		}
		m := srv.regexp.FindStringSubmatch(importPath)
		if m == nil {
			if srv.pathPrefix != "" {
				return nil, importErrorf(importPath, "invalid %s import path %q", srv.pathPrefix, importPath)
			}
			continue
		}

		// Build map of named subexpression matches for expand.

	// modRoot maps each module in versions to its absolute filesystem path.
	modRoot map[module.Version]string

	// pathPrefix is the path prefix for packages in the module, without a trailing
	// slash. For most modules, pathPrefix is just version.Path, but the
	// standard-library module "std" has an empty prefix.
	pathPrefix map[module.Version]string

	// inGorootSrc caches whether modRoot is within GOROOT/src.

	for _, v := range mms.Versions() {
		modRoot := mms.ModRoot(v)
		if dir == modRoot {
			return mms.PathPrefix(v), v
		}
		if str.HasFilePathPrefix(dir, modRoot) {
			pathPrefix := MainModules.PathPrefix(v)
			if pathPrefix > longestPrefix {
				longestPrefix = pathPrefix
				longestPrefixVersion = v
				suffix := filepath.ToSlash(str.TrimFilePathPrefix(dir, modRoot))

		for _, mainModule := range MainModules.Versions() {
			if MainModules.InGorootSrc(mainModule) {
				if dir, ok, err := dirInModule(path, MainModules.PathPrefix(mainModule), MainModules.ModRoot(mainModule), true); err != nil {
					return module.Version{}, MainModules.ModRoot(mainModule), dir, nil, err
				} else if ok {

		}
	} else {
		match = func(mod module.Version, roots []string, isLocal bool) *search.Match {
			m := search.NewMatch(pattern)
			prefix := mod.Path
			if MainModules.Contains(mod.Path) {
				prefix = MainModules.PathPrefix(module.Version{Path: mod.Path})
			}
			for _, root := range roots {
				if _, ok, err := dirInModule(pattern, prefix, root, isLocal); err != nil {
					m.AddError(err)
				} else if ok {