}
	return message + hint
}

func (e *ImportMissingSumError) ImportPath() string {
	return e.importPath
}

type invalidImportError struct {
	importPath string
	err        error
}

func (e *invalidImportError) ImportPath() string {
	return e.importPath
}

func (e *invalidImportError) Error() string {
	return e.err.Error()
}

			pxtestErr = err
		}
		if p1.Incomplete {
			pxtestIncomplete = true
		}
		if p1.ImportPath == p.ImportPath {
			pxtestNeedsPtest = true
		} else {
			ximports = append(ximports, p1)
		}
		p.XTestImports[i] = p1.ImportPath
	}
	p.XTestEmbedFiles, xtestEmbed, err = resolveEmbed(p.Dir, p.XTestEmbedPatterns)
	if err != nil && pxtestErr == nil {
		pxtestErr = &PackageError{
			ImportStack: stk.Copy(),

	}
	return rr, err
}

var errUnknownSite = errors.New("dynamic lookup required to find mapping")

// repoRootFromVCSPaths attempts to map importPath to a repoRoot
// using the mappings defined in vcsPaths.
func repoRootFromVCSPaths(importPath string, security web.SecurityMode, vcsPaths []*vcsPath) (*RepoRoot, error) {
	if str.HasPathPrefix(importPath, "example.net") {

// then lookupPackage returns that import.
// If multiple packages are imported as name, importPath returns "", false.
// Otherwise, if name is the name of p itself, importPath returns "", true,
// to signal a reference to p.
// Otherwise, importPath returns "", false.
func (p *Package) lookupPackage(name string) (importPath string, ok bool) {
	if path, ok := p.importByName[name]; ok {
		if path == "" {

		for _, root := range codeRoots() {
			if pkg.build.Dir == root.dir {
				importPath = root.importPath
				break
			}
			if strings.HasPrefix(pkg.build.Dir, root.dir+string(filepath.Separator)) {
				suffix := filepath.ToSlash(pkg.build.Dir[len(root.dir)+1:])
				if root.importPath == "" {
					importPath = suffix
				} else {
					importPath = root.importPath + "/" + suffix
				}
				break
			}
		}
	}

		}
		f.Decls = append(f.Decls[:i], f.Decls[i+1:]...)
		i--
	}

	return true
}

func isThirdParty(importPath string) bool {
	// Third party package import path usually contains "." (".com", ".org", ...)
	// This logic is taken from golang.org/x/tools/imports package.
	return strings.Contains(importPath, ".")
}

// DeleteImport deletes the import path from the file f, if present.

	}
	rewrite := ""

	rewriteDir := a.Package.Dir
	if cfg.BuildTrimpath {
		importPath := a.Package.Internal.OrigImportPath
		if m := a.Package.Module; m != nil && m.Version != "" {
			rewriteDir = m.Path + "@" + m.Version + strings.TrimPrefix(importPath, m.Path)
		} else {
			rewriteDir = importPath
		}
		rewrite += a.Package.Dir + "=>" + rewriteDir + ";"
	}

		return cmdErr
	}

	// Fetch defaults from the package.
	var p *load.Package
	a := sh.action
	if a != nil {
		p = a.Package
	}
	var importPath string
	if p != nil {
		importPath = p.ImportPath
		if desc == "" {
			desc = p.Desc()
		}
		if dir == "" {
			dir = p.Dir
		}
	}

	out := string(cmdOut)

	if !strings.HasSuffix(out, "\n") {

	}

	parts := strings.SplitN(string(bytes.TrimSpace(out)), ":", 4)
	if len(parts) < 2 {
		return errorf("%v: missing ':' in output: %q", cmd, out)
	}
	importPath = parts[0]
	if importPath == "" || importPath == "." {
		return errorf("current directory does not have a Go import path")
	}
	isStd, err = strconv.ParseBool(parts[1])
	if err != nil {

	p, err := Import("", testenv.GOROOT(t), FindOnly)
	if err == nil {
		t.Fatal(`Import("") returned nil error.`)
	}
	if p == nil {
		t.Fatal(`Import("") returned nil package.`)
	}
	if p.ImportPath != "" {
		t.Fatalf("ImportPath=%q, want %q.", p.ImportPath, "")
	}
}

func TestEmptyFolderImport(t *testing.T) {
	_, err := Import(".", "testdata/empty", 0)
	if _, ok := err.(*NoGoError); !ok {