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import scala.reflect.ClassTag
class A[Foo](implicit tag: ClassTag[Foo]) {
object ExtractFoo {
def unapply(foo: Foo): Boolean = true
}
def isFoo(x: Any) = x match {
case ExtractFoo() => true
//case foo: Foo => true
case _ => false
}
}
object Test {
def main(args: Array[String]): Unit = {
assert((new A[String]).isFoo("foo")) // OK
assert(!(new A[String]).isFoo(42)) // OK in scalac, fails in Dotty
}
}
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