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package object foo { type X[T, U] = (T => U) }
package foo {
abstract class Foo[T, U](val d: T => U) extends (T => U) {
def f1(r: X[T, U]) = r match { case x: Foo[_,_] => x.d } // inferred ok
def f2(r: X[T, U]): (T => U) = r match { case x: Foo[_,_] => x.d } // dealiased ok
def f3(r: X[T, U]): X[T, U] = r match { case x: Foo[_,_] => x.d } // alias not ok
// x.d : foo.this.package.type.X[?scala.reflect.internal.Types$NoPrefix$?.T, ?scala.reflect.internal.Types$NoPrefix$?.U] ~>scala.this.Function1[?scala.reflect.internal.Types$NoPrefix$?.T, ?scala.reflect.internal.Types$NoPrefix$?.U]
// at scala.Predef$.assert(Predef.scala:170)
// at scala.tools.nsc.Global.assert(Global.scala:235)
// at scala.tools.nsc.ast.TreeGen.mkCast(TreeGen.scala:252)
// at scala.tools.nsc.typechecker.Typers$Typer.typedCase(Typers.scala:2263)
}
}
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