code: func (importer *MemoryImporter) Import(importedFrom, importedPath string) (contents Contents, foundAt string, err error) {
  	if content, ok := importer.Data[importedPath]; ok {
  		return content, importedPath, nil
  	}
  	return Contents{}, "", fmt.Errorf("import not available %v", importedPath)
  }
docs: // Import fetches data from a map entry.
  // All paths are treated as absolute keys.