code: func (cache *ImportCache) ImportString(importedFrom, importedPath string, i *interpreter, trace TraceElement) (*valueString, error) {
  	data, _, err := cache.importData(importedFrom, importedPath)
  	if err != nil {
  		return nil, i.Error(err.Error(), trace)
  	}
  	return makeValueString(data.String()), nil
  }
docs: // ImportString imports a string, caches it and then returns it.