question: @ SuppressWarnings ( "TypeMayBeWeakened" ) static void closeIn ( OptimizedObjectInputStream in ) { U . close ( in , null ) ; if ( inPool != null ) { boolean b = inPool . offer ( in ) ; assert b ; } else { StreamHolder holder = holders . get ( ) ; if ( holder != null ) holder . releaseIn ( ) ; } }
target:  Closes and releases input stream.