More neg tests

Some random neg tests from previous experiments.

Author: odersky

tests/neg/classOf.scala

@@ -0,0 +1,11 @@
+object Test {
+
+  class C { type I }
+  type A = C
+
+  def f1[T] = classOf[T] // error
+  def f2[T <: String] = classOf[T] // error
+  val x = classOf[Test.type] // error
+  val y = classOf[C { type I = String }] // error
+  val z = classOf[A] // ok
+}

tests/neg/tate.scala

@@ -0,0 +1,11 @@
+    object unsound {
+      trait Bound[A, B <: A]
+      trait Bind[A] {
+        def bad[B <: A](bound: Bound[A, B], b: B) = b
+      }
+      def coerce[T, U](t: T): U = {
+        lazy val bound: Bound[U, _ >: T] = ??? // error: >: T does not conform to upper bound
+        def bind = new Bind[U] {}
+        bind.bad(bound, t)
+      }
+    }

tests/pending/neg/tate.scala

@@ -0,0 +1,11 @@
+trait Out[+T]
+
+object Test {
+
+  def foo[T <% AnyRef](x: T) = ???
+
+  var x: Out[_ >: String] = ???
+  var y: Out[String] = ???
+  x = y // should give error, but currently masked by covariant alias representation
+ // y = x
+}