test for allOverriddenSymbols

... to verify whether they work correctly.

Author: odersky

tests/pos/overrides.scala

@@ -0,0 +1,13 @@
+class A[T] {
+
+  def f(x: T)(y: T = x) = y
+
+}
+
+class B extends A[Int] {
+
+  def f(x: Int)(y: Int) = y
+
+  f(2)()
+
+}