tests: Update box tests (1050294:id)

backend.native/tests/external/codegen/box/objects/anonymousObjectReturnsFromTopLevelFun.kt

@@ -0,0 +1,22 @@
+interface IFoo {
+    fun foo(): String
+}
+
+interface IBar
+
+private fun createAnonObject() =
+        object : IFoo, IBar {
+            override fun foo() = "foo"
+            fun qux(): String = "qux"
+        }
+
+fun useAnonObject() {
+    createAnonObject().foo()
+    createAnonObject().qux()
+}
+
+fun box(): String {
+    if (createAnonObject().foo() != "foo") return "fail 1"
+    if (createAnonObject().qux() != "qux") return "fail 2"
+    return "OK"
+}