``` data class Data(val a: String, val b: String) ...

# arrow

[raulraja]

data class Data(val a: String, val b: String)
data class Error(val msg: String)
val data : Either<Error, Data> = Either.applicative<Error>().map("".right(), Error("oops").left(), ::Data).fix()
//Left(Error("oops"))

[raulraja]

@carbaj0 the issue is the applicative instance is incorrectly parameterised

[raulraja]

also if you just want to gather results you can use tupled

[raulraja]

map is only useful if you plan to transform them in the map function otherwise tupled is all you need