Add data modifier to a class quickfix #KT-18220 Fixed

idea/testData/quickfix/addDataModifier/test2.kt.after

@@ -0,0 +1,7 @@
+// "Make 'Foo' data class" "true"
+data class Foo(val bar: String, var baz: Int)
+
+fun test() {
+    val foo = Foo("A", 1)
+    var (bar, baz) = foo<caret>
+}