"!is" in when case

idea/testData/findUsages/kotlin/conventions/components/dataClass.2.kt

@@ -33,7 +33,7 @@ fun y(o: Any) {
     val (x, y) = list[0]
 }
 
-fun z(o: Any) {
+fun when1(o: Any) {
     when (o) {
         is A -> {
             val (x, y) = o
@@ -44,3 +44,13 @@ fun z(o: Any) {
         else -> return
     }
 }
+
+fun when2(o: Any) {
+    when (o) {
+        !is A -> { }
+
+        else -> {
+            val (x, y) = o
+        }
+    }
+}

idea/testData/findUsages/kotlin/conventions/components/dataClass.results.txt

@@ -12,6 +12,7 @@
 [dataClass.2.kt] Value read 33 val (x, y) = list[0]
 [dataClass.2.kt] Value read 39 val (x, y) = o
 [dataClass.2.kt] Value read 5 a.n
+[dataClass.2.kt] Value read 53 val (x, y) = o
 [dataClass.2.kt] Value read 8 val (x, y, z) = a
 [dataClass.2.kt] Value read 9 val (x1, y1, z1) = f()
 [dataClass.3.kt] Value read 12 val (x, y, z) = a