Test refactoring

compiler/testData/diagnostics/tests/smartCasts/kt3244.kt

@@ -0,0 +1,12 @@
+// Should work already in M11
+
+open class A(val s : String)
+class B(s : String) : A(s)
+
+fun test(a : A): String? {
+    if (a is B) {
+        // Earlier (14.01.2013) reported overload ambiguity over s
+        return a.s 
+    }
+    return null
+}