Convert pos test to be a run test.

Author: odersky

tests/pos/traitParams.scala

@@ -0,0 +1,19 @@
+trait T(x: Int, val y: Int) {
+  def f = x
+}
+
+trait U extends T {
+  override def f = super.f + y
+}
+
+class C(x: Int) extends U with T(x, x * x)
+
+class D extends C(10) with T {
+
+}
+
+object Test {
+  def main(args: Array[String]): Unit =
+    assert(new D().f == 110)
+}
+