Daniele Segato
07/04/2018, 2:05 PMType inference failed:
fun <T1 : Any!, T2 : Any!, R : Any!> zip(p0: SingleSource<out T1!>!, p1: SingleSource<out T2!>!, p2: BiFunction<in T1!, in T2!, out R!>!): Single<R!>!
cannot be applied to
(Single<String!>!,Single<Int!>!,(???, ???) -> String)