Extract Function: Implement duplicate search

idea/testData/refactoring/extractFunction/duplicates/outputValueMatching.kt

@@ -0,0 +1,41 @@
+// WITH_RUNTIME
+// PARAM_TYPES: kotlin.Int
+// PARAM_DESCRIPTOR: value-parameter val a: kotlin.Int defined in test
+
+// SIBLING:
+fun test(a: Int): Int {
+    <selection>println(a)
+    return a + 1</selection>
+}
+
+fun foo1(): Int {
+    val x = 1
+    println(x)
+    val y = x + 1
+    return y
+}
+
+fun foo2(): () -> Int {
+    val z = 1
+    return {
+        println(z)
+        z + 1
+    }
+}
+
+fun foo3() {
+    var t = 1
+    println(t)
+    t = t + 1
+    println(t)
+}
+
+fun foo4(a: Int): Int {
+    val t = println(a)
+    return a + 1
+}
+
+fun foo5(a: Int) {
+    println(a)
+    a + 1
+}