Add test

Author: odersky

tests/run/scrutable.check

@@ -0,0 +1,2 @@
+class java.lang.Integer
+class java.lang.String

tests/run/scrutable.scala

@@ -0,0 +1,9 @@
+def foo[T](x: Any): Scrutable =
+  println(x.getClass())
+  x
+
+@main def Test =
+  val x: Scrutable = foo(1)
+  val y: Scrutable = foo("hello")
+  assert(x != y)
+