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object FooExample {
sealed trait Foo {
def i: Int
}
private case class SecretFoo(i: Int) extends Foo
/* Without the explicit return type, we'd get this compiler error:
*
* <console>:14: error: private class SecretFoo escapes its defining scope...
*
*/
def buildFoo(i: Int): Either[String, Foo] = if (i < 0)
Left("Need non-negative integer!")
else
Right(SecretFoo(i))
}
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