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class A {
override def equals(other: Any) = other match {
case _: this.type => true
case _ => false
}
}
object Test {
def main(args: Array[String]): Unit = {
val x1 = new A
val x2 = new A
assert(x1 == x1)
assert(x1 != x2)
assert(x1 != ())
assert(x2 != x1)
}
}
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