1 files changed, 106 insertions, 0 deletions
diff --git a/tests/untried/neg/found-req-variance.scala b/tests/untried/neg/found-req-variance.scala
new file mode 100644
index 000000000..de460f2d0
--- /dev/null
+++ b/tests/untried/neg/found-req-variance.scala
@@ -0,0 +1,106 @@
+import scala.collection.mutable.ListBuffer
+
+class A
+class B extends A
+class C extends B
+
+trait FF1[T, +R]
+trait FF2[-T, R]
+
+class Inv[T]
+class InvA extends Inv[A]
+class InvB extends Inv[B]
+class InvC extends Inv[C]
+
+class Multi[+Cov, Inv, -Con]
+class MultiCov[+T <: A] extends Multi[T, B, C]
+class MultiInv[T] extends Multi[A, T, C]
+class MultiCon[-T >: C] extends Multi[A, B, T]
+
+object Test {
+  def f1 = Set[Inv[A]]() + new Inv[A]
+  def f2 = Set[Inv[A]]() + new Inv[B]
+  def f3 = Set[Inv[A]]() + new Inv[C]
+  def f4 = Set[Inv[B]]() + new Inv[A]
+  def f5 = Set[Inv[B]]() + new Inv[B]
+  def f6 = Set[Inv[B]]() + new Inv[C]
+  def f7 = Set[Inv[C]]() + new Inv[A]
+  def f8 = Set[Inv[C]]() + new Inv[B]
+  def f9 = Set[Inv[C]]() + new Inv[C]
+
+  def g1 = Set[Multi[A, B, C]]() + new MultiCov[A]
+  def g2 = Set[Multi[A, B, C]]() + new MultiCov[B]
+  def g3 = Set[Multi[A, B, C]]() + new MultiCov[C]
+  def g4 = Set[Multi[A, B, C]]() + new MultiInv[A]
+  def g5 = Set[Multi[A, B, C]]() + new MultiInv[B]
+  def g6 = Set[Multi[A, B, C]]() + new MultiInv[C]
+  def g7 = Set[Multi[A, B, C]]() + new MultiCon[A]
+  def g8 = Set[Multi[A, B, C]]() + new MultiCon[B]
+  def g9 = Set[Multi[A, B, C]]() + new MultiCon[C]
+}
+
+object Functions {
+  object Set1 {
+    def f[T, R](x: FF1[T, R]) = ()
+    def h[T, R] : FF1[T, R] = sys.error("")
+
+    def ff1 = f[B, B](h[A, A]) // fail
+    def ff2 = f[B, B](h[B, A]) // fail
+    def ff3 = f[B, B](h[C, A]) // fail
+    def ff4 = f[B, B](h[A, B]) // suggest
+    def ff5 = f[B, B](h[B, B]) // ok
+    def ff6 = f[B, B](h[C, B]) // suggest
+    def ff7 = f[B, B](h[A, C]) // suggest
+    def ff8 = f[B, B](h[B, C]) // ok
+    def ff9 = f[B, B](h[C, C]) // suggest
+  }
+  object Set2 {
+    def f[T, R](x: FF2[T, R]) = ()
+    def h[T, R] : FF2[T, R] = sys.error("")
+
+    def ff1 = f[B, B](h[A, A]) // suggest
+    def ff2 = f[B, B](h[B, A]) // suggest
+    def ff3 = f[B, B](h[C, A]) // fail
+    def ff4 = f[B, B](h[A, B]) // ok
+    def ff5 = f[B, B](h[B, B]) // ok
+    def ff6 = f[B, B](h[C, B]) // fail
+    def ff7 = f[B, B](h[A, C]) // suggest
+    def ff8 = f[B, B](h[B, C]) // suggest
+    def ff9 = f[B, B](h[C, C]) // fail
+  }
+}
+
+// TODO
+// object TypeAlias {
+//   type LL[T] = List[T]
+//   val LL = List
+//
+//   def f1 = Set[LL[B]]() + LL[A](new A)
+//   def f2 = Set[LL[B]]() + LL[C](new C)
+// }
+
+object Javas {
+  def f[T](x: java.util.List[T]) = ()
+  def g[T](x: java.util.Comparator[T]) = ()
+
+  def g1 = f[AnyRef](new java.util.ArrayList[String] { })
+  def g2 = g[String](Ordering.fromLessThan[AnyRef](_.toString < _.toString))
+}
+
+object Misc {
+  // original motivation
+  class Data[A <: AnyVal]
+  class MyData extends Data[Int] { }
+  def f1 = Set[Data[AnyVal]]() + new MyData
+
+  // from stackoverflow
+  def foo(s: Set[CharSequence]): Unit = ()
+  def f4 = {
+    val s: Set[String] = Set("Hello", "World");
+    foo(s)
+  }
+
+  class Trippy[+T1, T2, +T3]
+  def g1 = Set[Trippy[AnyRef, AnyRef, AnyRef]]() + new Trippy[String, String, String]
+  def g2 = Set[Map[String, String]]() + Map[AnyRef, String]()
+}