Add test case for hk bounds checking

Author: odersky

tests/neg/hk-bounds.scala

@@ -0,0 +1,23 @@
+class Foo[A]
+class Bar[B]
+class Baz[C] extends Bar[C]
+
+object Test1 {
+  type Alias[F[X] <: Foo[X]] = F[Int]
+
+  val x: Alias[Bar] = new Bar[Int] // error: Type argument [X0] -> Bar[X0] does not conform to upper bound [X0] -> Foo[X0]
+
+  def foo[F[X] <: Foo[X]] = ()
+  foo[Bar] // error: Type argument [X0] -> Bar[X0] does not conform to upper bound [X0] -> Foo[X0]
+
+  def bar[B[X] >: Bar[X]] = ()
+  bar[Bar] // ok
+  bar[Baz] // // error: Type argument [X0] -> Baz[X0] does not conform to lower bound [X0] -> Bar[X0]
+  bar[Foo] // error: Type argument [X0] -> Foo[X0] does not conform to lower bound [X0] -> Bar[X0]
+
+  def baz[B[X] >: Baz[X]] = ()
+  baz[Bar] //ok
+  baz[Baz] //ok
+  baz[Foo] // error: Type argument [X0] -> Foo[X0] does not conform to lower bound [X0] -> Baz[X0]
+
+}