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Andrea Ferretti (andrea) said:
Sorry, I am quite new to Scala (as in less than 1 month). I actually do not know what is going wrong here. This is as minimal as I could get, but I do not know the internals of Scalaz, hence I do not know how to make it simpler.
Trying to compile
import scalaz.OptionT.optionT
type Foo[A] = Option[Option[A]]
val x: Foo[Int] = Some(Some(3))
optionT( x )
results in a compiler exception
java.lang.IllegalArgumentException: transpose requires all collections have the same size
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