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// pattern matcher crashes here trying to synthesize an unneeded outer test.
// no-symbol does not have an owner
// at scala.reflect.internal.SymbolTable.abort(SymbolTable.scala:49)
// at scala.tools.nsc.Global.abort(Global.scala:253)
// at scala.reflect.internal.Symbols$NoSymbol.owner(Symbols.scala:3248)
// at scala.reflect.internal.Symbols$Symbol.effectiveOwner(Symbols.scala:678)
// at scala.reflect.internal.Symbols$Symbol.isDefinedInPackage(Symbols.scala:664)
// at scala.reflect.internal.TreeGen.mkAttributedSelect(TreeGen.scala:188)
// at scala.reflect.internal.TreeGen.mkAttributedRef(TreeGen.scala:124)
// at scala.tools.nsc.ast.TreeDSL$CODE$.REF(TreeDSL.scala:308)
// at scala.tools.nsc.typechecker.PatternMatching$TreeMakers$TypeTestTreeMaker$treeCondStrategy$.outerTest(PatternMatching.scala:1209)
class Crash {
type Alias = C#T
val c = new C
val t = new c.T
// Crash via a Typed Pattern...
(t: Any) match {
case e: Alias =>
}
// ... or via a Typed Extractor Pattern.
object Extractor {
def unapply(a: Alias): Option[Any] = None
}
(t: Any) match {
case Extractor() =>
case _ =>
}
// checking that correct outer tests are applied when
// aliases for path dependent types are involved.
val c2 = new C
type CdotT = c.T
type C2dotT = c2.T
val outerField = t.getClass.getDeclaredFields.find(_.getName contains ("outer")).get
outerField.setAccessible(true)
(t: Any) match {
case _: C2dotT =>
println(s"!!! wrong match. t.outer=${outerField.get(t)} / c2 = $c2") // this matches on 2.10.0
case _: CdotT =>
case _ =>
println(s"!!! wrong match. t.outer=${outerField.get(t)} / c = $c")
}
}
class C {
class T
}
object Test extends App {
new Crash
}
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