Add a test that checks that no useless forwarders are being created.

Author: DarkDimius

tests/run/no-useless-forwarders.scala

@@ -0,0 +1,17 @@
+trait A {
+  def foo(a: Int): Int = a
+  def bar(a: Int): Int
+}
+
+trait B {
+  def bar(a: Int): Int = a
+}
+
+object Test extends A with B{
+  def main(args: Array[String]) = {
+    assert(!this.getClass.getDeclaredMethods.exists{x: java.lang.reflect.Method => x.getName == "foo"}, 
+      "no forwarder is needed here")
+    assert(!this.getClass.getDeclaredMethods.exists{x: java.lang.reflect.Method => x.getName == "bar"}, 
+      "no forwarder is needed here")
+  }
+}