convert to func2 type predicate . concode_field_sep Func2<? super T,Integer,Boolean> predicate concode_field_sep Subscriber<? super T> call
Func2 < T , Integer , Boolean > function ( final Func1 < ? super T , Boolean > arg0 ) { return new Func2 < T , Integer , Boolean > ( ) { @ Override public Boolean call ( T arg1 , Integer arg2 ) { return arg0 . call ( arg1 ) ; } } ; }