stdPackages = append(stdPackages, ip)
			}
			importDir[pkg.ImportPath] = pkg.Dir
			if len(pkg.ImportMap) > 0 {
				importMap[pkg.Dir] = make(map[string]string, len(pkg.ImportMap))
			}
			for k, v := range pkg.ImportMap {
				importMap[pkg.Dir][k] = v
			}
		}

		sort.Strings(stdPackages)
		imports = listImports{
			stdPackages: stdPackages,
			importMap:   importMap,

	*context = build.Default
	context.Dir = filepath.Join(testenv.GOROOT(t), "src")

	w := NewWalker(context, context.Dir)
	for _, pkg := range w.stdPackages {
		if strings.HasPrefix(pkg, "vendor/") || strings.HasPrefix(pkg, "golang.org/x/") {
			t.Fatalf("stdPackages contains unexpected package %s", pkg)
		}
	}
}

func TestIssue64958(t *testing.T) {
	defer func() {
		if x := recover(); x != nil {