if modRoot == "" {
		panic("vendor directory does not exist when in single module mode outside of a module")
	}
	return filepath.Join(modRoot, "vendor")
}

func inWorkspaceMode() bool {
	if !initialized {
		panic("inWorkspaceMode called before modload.Init called")
	}
	if !Enabled() {
		return false
	}
	return workFilePath != ""
}

// HasModRoot reports whether a main module is present.

	}

	var graphRoots []module.Version
	if inWorkspaceMode() {
		graphRoots = roots
	} else {
		graphRoots = MainModules.Versions()
	}
	var (
		mu       sync.Mutex // guards mg.g and hasError during loading
		hasError bool
		mg       = &ModuleGraph{
			g: mvs.NewGraph(cmpVersion, graphRoots),
		}
	)

	if pruning != workspace {
		if inWorkspaceMode() {

					mods = append(mods, vendorPkgModule[path])
					dirs = append(dirs, dir)
					roots = append(roots, vendorDir)
				} else {
					subCommand := "mod"
					if inWorkspaceMode() {
						subCommand = "work"
					}

				break
			}
		}
		if !found && search.InDir(absDir, cfg.GOROOTsrc) == "" && pathInModuleCache(ctx, absDir, rs) == "" {
			m.Dirs = []string{}
			scope := "main module or its selected dependencies"
			if inWorkspaceMode() {
				scope = "modules listed in go.work or their selected dependencies"
			}
			m.AddError(fmt.Errorf("directory prefix %s does not contain %s", base.ShortPath(absDir), scope))
			return
		}
	}