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object Test {
val xs: List[(Int, Int)] = List((2, 2), null)
def expectMatchError[T](msg: String)(body: => T) {
try { body ; assert(false, "Should not succeed.") }
catch { case _: MatchError => println(msg) }
}
def main(args: Array[String]): Unit = {
expectMatchError("I hereby refute null!")( for ((x, y) <- xs) yield x )
expectMatchError("I denounce null as unListLike!")( (null: Any) match { case List(_*) => true } )
}
}
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