package Ġio . tank er . api Ċ Ċ // Ġn io . channels . Completion Handler Ġrequires ĠAPI Ġ 2 6 Ċ // Ġprovide Ġour Ġown Ġinterface Ġas Ġa Ġreplacement Ċ Ċ interface ĠT ank er Completion Handler < V , ĠA > Ġ{ ĊĠĠĠ Ġfun Ġcompleted ( result : ĠV , Ġattachment : ĠA ) ĊĠĠĠ Ġfun Ġfailed ( exc : ĠThrowable , Ġattachment : ĠA ) Ċ }