Add pos test

Author: odersky

tests/pos/i2324.scala

@@ -0,0 +1,16 @@
+object A {
+  def foo: Int = 1
+}
+object B {
+  def foo: Int = 2
+}
+class C {
+  import A._
+  import B._
+
+  def bar: Int = 4
+
+  def foo: Int = 3
+
+  println(foo)
+}