New pos tests

Some of them were moved from disabled after verifiying that they compile now.

Author: odersky

tests/pos/intersection.scala

@@ -0,0 +1,19 @@
+object intersection {
+
+  class A
+  class B
+
+  val x: A => Unit = ???
+  val y: B => Unit = ???
+
+  val z = if (???) x else y
+
+  val a: A & B => Unit = z
+  val b: (A => Unit) | (B => Unit) = z
+
+
+
+
+  type needsA = A => Nothing
+  type needsB = B => Nothing
+}

tests/pos/jon.scala

@@ -0,0 +1,8 @@
+// This one blows up with a huge type in Scala 2.
+// Reported by Jon Pretty in his talk on Scala type inference.
+object Test {
+
+  val x = List(List, Vector)
+
+  val y: List[scala.collection.generic.SeqFactory] = x
+}

tests/pos/pets.scala

@@ -0,0 +1,21 @@
+// Representing the current type
+trait Pet {
+  type This <: Pet
+  def name: String
+  def renamed(newName: String): This
+}
+
+case class Fish(name: String, age: Int) extends Pet {
+  type This = Fish
+  def renamed(newName: String): Fish = copy(name = newName)
+}
+
+case class Kitty(name: String, age: Int) extends Pet {
+  type This = Kitty
+  def renamed(newName: String): Kitty = copy(name = newName)
+}
+
+object Test {
+  def esquire[A <: Pet](a: A): a.This = a.renamed(a.name + ", Esq.")
+  val f: Fish = esquire(new Fish("bob", 22))
+}

tests/pos/sort.scala

@@ -0,0 +1,7 @@
+object sorting {
+
+  val xs: Array[String] = ???
+
+  java.util.Arrays.sort(xs, ???)
+
+}

tests/pos/staleSymbol.scala

@@ -0,0 +1,7 @@
+object intersection {
+
+  class A
+  class B
+
+  val x: A => Unit = ???
+}