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object Test {
final class Foo(val x: String) extends AnyVal { override def toString = "" + x }
final class Bar(val f: Foo) extends AnyVal { override def toString = "" + f }
def main(args: Array[String]) = {
val x = "abc"
val f = new Foo(x)
val b = new Bar(f)
assert(b.toString == "abc")
}
}
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