Intentions: function <-> property conversion

idea/testData/intentions/convertFunctionToProperty/unaryOp.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+// IS_APPLICABLE: false
+class A(val n: Int) {
+    fun <caret>minus(): A = A(-n)
+}
+
+fun test() {
+    val t = -A(1)
+}