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object Test {
def wrap[T >: Null](body: => T) =
try body
catch { case _: IllegalArgumentException => null }
def main(args: Array[String]): Unit = {
assert(wrap(Nil.transpose) == Nil)
assert(wrap(List(List(1, 2), List(1)).transpose) == null)
assert(wrap(List(List(1), List(1, 2)).transpose) == null)
assert(wrap(List(List(1, 2), List(1, 2)).transpose) == List(List(1, 1), List(2, 2)))
}
}
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