}

	// Check each module on the build list.
	var dirs, roots []string
	var mods []module.Version

	// Is the package in the standard library?
	pathIsStd := search.IsStandardImportPath(path)
	if pathIsStd && modindex.IsStandardPackage(cfg.GOROOT, cfg.BuildContext.Compiler, path) {
		for _, mainModule := range MainModules.Versions() {
			if MainModules.InGorootSrc(mainModule) {