regression test for KT-4281

compiler/testData/codegen/box/regressions/kt4281.kt

@@ -0,0 +1,15 @@
+abstract class C {
+    fun test(x: Int) {
+        if (x == 0) return
+        if (this is D) {
+            (this: D).test(x - 1)
+        }
+    }
+}
+
+class D: C()
+
+fun box(): String {
+    D().test(10)
+    return "OK"
+}

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -6061,6 +6061,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("kt4281.kt")
+        public void testKt4281() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/regressions/kt4281.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt4682.kt")
         public void testKt4682() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/regressions/kt4682.kt");