func (fp *filePipeline) Open() (f *fileutil.LockedFile, err error) {
	select {
	case f = <-fp.filec:
	case err = <-fp.errc:
	}
	return f, err
}
func (fp *filePipeline) Open() (f *fileutil.LockedFile, err error) {
	select {
	case f = <-fp.filec:
	case err = <-fp.errc:
	}
	return f, err
}
func ( fp * filePipeline ) Open ( ) ( f * fileutil . LockedFile , err error ) { select { case f = <- fp . filec : case err = <- fp . errc : } return f , err }
// Open returns a fresh file for writing. Rename the file before calling
// Open again or there will be file collisions.
Open returns a fresh file for writing . Rename the file before calling Open again or there will be file collisions .