Extract Function: Implement validation

idea/testData/refactoring/extractFunction/basic/localClassFunctionRef.kt

@@ -0,0 +1,8 @@
+// NEXT_SIBLING:
+fun foo(a: Int): Int {
+    class A {
+        fun bar(): Int = a + 10
+    }
+
+    return <selection>A().bar()</selection>
+}

idea/testData/refactoring/extractFunction/basic/localClassFunctionRef.kt.conflicts

@@ -0,0 +1 @@
+class foo.A will no longer be accessible after extraction

idea/testData/refactoring/extractFunction/basic/localClassPropertyRef.kt

@@ -0,0 +1,8 @@
+// NEXT_SIBLING:
+fun foo(a: Int): Int {
+    class A {
+        val bar: Int = a + 10
+    }
+
+    return <selection>A().bar</selection>
+}

idea/testData/refactoring/extractFunction/basic/localClassPropertyRef.kt.conflicts

@@ -0,0 +1 @@
+class foo.A will no longer be accessible after extraction

idea/testData/refactoring/extractFunction/basic/localFunctionRef.kt

@@ -0,0 +1,6 @@
+// NEXT_SIBLING:
+fun foo(a: Int): Int {
+    fun bar(): Int = a + 10
+
+    return <selection>bar()</selection>
+}

idea/testData/refactoring/extractFunction/basic/localFunctionRef.kt.conflicts

@@ -0,0 +1 @@
+function foo.bar will no longer be accessible after extraction

idea/testData/refactoring/extractFunction/basic/misdirectedRef.kt

@@ -0,0 +1,8 @@
+// NEXT_SIBLING:
+fun bar(): Int = 100
+
+fun foo(a: Int): Int {
+    fun bar(): Int = a + 10
+
+    return <selection>bar()</selection>
+}

idea/testData/refactoring/extractFunction/basic/misdirectedRef.kt.conflicts

@@ -0,0 +1 @@
+function foo.bar will no longer be accessible after extraction

idea/testData/refactoring/extractFunction/basic/privateMemberRef.kt

@@ -0,0 +1,8 @@
+// NEXT_SIBLING:
+class A {
+    private val t: Int = 1
+
+    fun foo(): Int {
+        return <selection>t</selection>
+    }
+}

idea/testData/refactoring/extractFunction/basic/privateMemberRef.kt.conflicts

@@ -0,0 +1 @@
+property A.t will become invisible after extraction

idea/testData/refactoring/extractFunction/basic/refInReturn.kt

@@ -0,0 +1,6 @@
+// NEXT_SIBLING:
+fun foo(a: Int): Int {
+    <selection>println(a)
+    if (a > 0) return a</selection>
+    return -a
+}

idea/testData/refactoring/extractFunction/basic/refInReturn.kt.after

@@ -0,0 +1,11 @@
+// NEXT_SIBLING:
+fun b(a: Int): Boolean {
+    println(a)
+    if (a > 0) return true
+    return false
+}
+
+fun foo(a: Int): Int {
+    if (b(a)) return a
+    return -a
+}