fix #13346: add regression test

Author: bishabosha

tests/pos/i13346.scala

@@ -0,0 +1,19 @@
+object Outer_Typed {
+  object Inner {
+    class ClassUntyped(x: Int)
+    class ClassTyped[T](x: T) // notice type parameter
+
+    // ok
+    val _ = new ClassUntyped(42)
+    val _ = new ClassTyped("42")
+    val _ = ClassUntyped(42)
+    val _ = ClassTyped("42")
+  }
+
+  export Inner._
+
+  val _ = new ClassUntyped(42)
+  val _ = new ClassTyped("42")
+  val _ = ClassUntyped(42)
+  val _ = ClassTyped("42") // error: Not found: ClassTyped
+}