Minor: add regression test for KT-41806

compiler/fir/fir2ir/tests/org/jetbrains/kotlin/codegen/ir/FirBlackBoxCodegenTestGenerated.java

@@ -28553,6 +28553,11 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/regressions/kt4142.kt");
         }
 
+        @TestMetadata("kt41806.kt")
+        public void testKt41806() throws Exception {
+            runTest("compiler/testData/codegen/box/regressions/kt41806.kt");
+        }
+
         @TestMetadata("kt4259.kt")
         public void testKt4259() throws Exception {
             runTest("compiler/testData/codegen/box/regressions/kt4259.kt");

compiler/testData/codegen/box/regressions/kt41806.kt

@@ -0,0 +1,26 @@
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+// IGNORE_BACKEND_FIR: JVM_IR
+
+open class A {
+    fun Foo() {
+        print("Fop")
+    }
+}
+class B() : A()
+
+class C() : A()
+
+fun box(): String {
+    var test : A = B()
+
+    println((test as B).toString())
+
+    listOf(1,2 ,3).forEach { it ->
+        test = C()
+    }
+
+    test.Foo()
+
+    return "OK"
+}

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

@@ -30319,6 +30319,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/regressions/kt4142.kt");
         }
 
+        @TestMetadata("kt41806.kt")
+        public void testKt41806() throws Exception {
+            runTest("compiler/testData/codegen/box/regressions/kt41806.kt");
+        }
+
         @TestMetadata("kt4259.kt")
         public void testKt4259() throws Exception {
             runTest("compiler/testData/codegen/box/regressions/kt4259.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -27953,6 +27953,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/regressions/kt4142.kt");
         }
 
+        @TestMetadata("kt41806.kt")
+        public void testKt41806() throws Exception {
+            runTest("compiler/testData/codegen/box/regressions/kt41806.kt");
+        }
+
         @TestMetadata("kt4259.kt")
         public void testKt4259() throws Exception {
             runTest("compiler/testData/codegen/box/regressions/kt4259.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -28553,6 +28553,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/regressions/kt4142.kt");
         }
 
+        @TestMetadata("kt41806.kt")
+        public void testKt41806() throws Exception {
+            runTest("compiler/testData/codegen/box/regressions/kt41806.kt");
+        }
+
         @TestMetadata("kt4259.kt")
         public void testKt4259() throws Exception {
             runTest("compiler/testData/codegen/box/regressions/kt4259.kt");