Remove warning and add tests when this warning had been reproducible

idea/testData/resolve/referenceInLib/inLibrarySource/localFun.kt

@@ -0,0 +1,9 @@
+package inlibrary.test
+
+public fun topLevel(): Int {
+    fun local(): Int {
+        return 1
+    }
+
+    return local()
+}