Extract Function: Add test data

idea/testData/refactoring/extractFunction/controlFlow/unextractable/anonymousObject.kt

@@ -0,0 +1,15 @@
+trait Callable<T> {
+    fun call(): T
+}
+
+fun foo(a: Int): Int {
+    // NEXT_SIBLING:
+    val o = <selection>object: Callable<Int> {
+        val b: Int = 1
+
+        override fun call(): Int {
+            return a + b
+        }
+    }</selection>
+    return o.call()
+}