}
		seen[modRoot] = true
		modRoots = append(modRoots, modRoot)
	}

	for _, g := range wf.Godebug {
		if err := CheckGodebug("godebug", g.Key, g.Value); err != nil {
			return nil, nil, fmt.Errorf("error loading go.work:\n%s:%d: %w", base.ShortPath(path), g.Syntax.Start.Line, err)
		}
	}

	return wf, modRoots, nil
}

		for _, r := range replaces {
			if seenrep[r.Old] {
				continue // Don't print the same error more than once
			}
			seenrep[r.Old] = true
			rNew, modRoot, replacementSource := replacementFrom(r.Old)
			rNewCanonical := canonicalizeReplacePath(rNew, modRoot)
			vr := vendorMeta[r.Old].Replacement
			if vr == (module.Version{}) {
				if rNewCanonical == (module.Version{}) {

				modload.MustHaveModRoot()
				var modRoots []string
				for _, m := range modload.MainModules.Versions() {
					modRoots = append(modRoots, modload.MainModules.ModRoot(m))
				}
				var plural string
				if len(modRoots) != 1 {
					plural = "s"
				}
				return errSet(fmt.Errorf("%s%s is not within module%s rooted at %s", q.pattern, absDetail, plural, strings.Join(modRoots, ", ")))
			}

	var pkgNotFoundErr error
	pkgNotFoundLongestPrefix := ""
	for _, mainModule := range MainModules.Versions() {
		modRoot := MainModules.ModRoot(mainModule)
		if modRoot != "" && str.HasFilePathPrefix(absDir, modRoot) && !strings.Contains(absDir[len(modRoot):], "@") {
			suffix := filepath.ToSlash(str.TrimFilePathPrefix(absDir, modRoot))
			if pkg, found := strings.CutPrefix(suffix, "vendor/"); found {
				if cfg.BuildMod != "vendor" {

					m.Pkgs = []string{pattern}
				}
			}
			return m
		}
	}

	var mainModuleMatches []module.Version
	for _, mainModule := range MainModules.Versions() {
		m := match(mainModule, modRoots, true)
		if len(m.Pkgs) > 0 {
			if query != "upgrade" && query != "patch" {
				return nil, nil, &QueryMatchesPackagesInMainModuleError{
					Pattern:  pattern,
					Query:    query,
					Packages: m.Pkgs,

	}
	if cfg.BuildMod == "vendor" {
		// Even if the main module is in the module cache,
		// its vendored dependencies are not loaded from their
		// usual cached locations.
		return nil, errNotFromModuleCache
	}
	modroot = filepath.Clean(modroot)
	if str.HasFilePathPrefix(modroot, cfg.GOROOTsrc) || !str.HasFilePathPrefix(modroot, cfg.GOMODCACHE) {
		return nil, errNotFromModuleCache
	}

// be indexed because it contains symlinks.
func indexModule(modroot string) ([]byte, error) {
	fsys.Trace("indexModule", modroot)
	var packages []*rawPackage

	// If the root itself is a symlink to a directory,
	// we want to follow it (see https://go.dev/issue/50807).
	// Add a trailing separator to force that to happen.
	root := str.WithFilePathSeparator(modroot)

			walkPkgs(filepath.Join(cfg.GOROOTsrc, "cmd"), "cmd", pruneGoMod)
		}
	}

	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
	}

					return module.Version{}, MainModules.ModRoot(mainModule), dir, nil, err
				} else if ok {
					return mainModule, MainModules.ModRoot(mainModule), dir, nil, nil
				}
			}
		}
		dir := filepath.Join(cfg.GOROOTsrc, path)
		modroot = cfg.GOROOTsrc
		if str.HasPathPrefix(path, "cmd") {
			modroot = filepath.Join(cfg.GOROOTsrc, "cmd")
		}

	os.Setenv("PWD", altRoot)
	goCmd(nil, "build", "-buildmode=plugin", "-o", filepath.Join(modRoot, "plugin-mismatch.so"), "./plugin-mismatch")

	os.Setenv("GOPATH", GOPATH)
	if err := os.Chdir(modRoot); err != nil {
		log.Panic(err)
	} else {
		prettyPrintf("cd %s\n", modRoot)
	}
	os.Setenv("PWD", modRoot)

	os.Setenv("LD_LIBRARY_PATH", modRoot)

	goCmd(nil, "build", "-buildmode=plugin", "./plugin1")