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object PatmatADT {
abstract sealed class Odd(x: Odd)
case class Good(x: Odd) extends Odd(x)
case class Bad(x: Odd) extends Odd(x)
def foo1a(x: Odd) = x match { // warning: Good(_: Bad), Bad(_: Good)
case Good(_: Good) => false
case Bad(_: Bad) => false
}
def foo1b(x: Odd) = x match {
case Good(_: Good) => false
case Bad(_: Bad) => false
case Good(_: Bad) => false
case Bad(_: Good) => false
}
def foo2(x: Option[Int]) = x match { // warning: Some(_: Int)
case Some(_: Double) => true
case None => true
}
def foo3a[T](x: Option[T]) = (x, x) match { // warning: (Some(_), Some(_)), (None, Some(_))
case (Some(_), None) => true
case (None, None) => true
}
def foo3b[T](x: Option[T]) = (x, x) match { // warning: (Some(_), Some(_)), (None, None)
case (Some(_), None) => true
case (None, Some(_)) => true
}
sealed trait Base
case class Foo() extends Base
def foo4(x: Base) = x match {
case Foo() =>
}
sealed abstract class CL3Literal
case object IntLit extends CL3Literal
case object CharLit extends CL3Literal
case object BooleanLit extends CL3Literal
sealed abstract class Tree
case class LetL(value: CL3Literal) extends Tree
def foo5(tree: Tree) : Any = tree match {
case LetL(CharLit) =>
}
def foo6[T](l: List[T]): Boolean = l match {
case x::xs => true
case Nil => false
}
}
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