diff --git a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
index 42d604bf23f..72af0f9bb4a 100644
--- a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
+++ b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java
@@ -32555,6 +32555,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/when/kt48653_before.kt");
             }
 
+            @Test
+            @TestMetadata("kt49702.kt")
+            public void testKt49702() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/when/kt49702.kt");
+            }
+
             @Test
             @TestMetadata("kt9929.kt")
             public void testKt9929() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
index c877b88be57..bd93fd3003f 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
@@ -32555,6 +32555,12 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                 runTest("compiler/testData/diagnostics/tests/when/kt48653_before.kt");
             }
 
+            @Test
+            @TestMetadata("kt49702.kt")
+            public void testKt49702() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/when/kt49702.kt");
+            }
+
             @Test
             @TestMetadata("kt9929.kt")
             public void testKt9929() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
index c3796125be5..1de434c3b08 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java
@@ -32555,6 +32555,12 @@ public class FirOldFrontendDiagnosticsWithLightTreeTestGenerated extends Abstrac
                 runTest("compiler/testData/diagnostics/tests/when/kt48653_before.kt");
             }
 
+            @Test
+            @TestMetadata("kt49702.kt")
+            public void testKt49702() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/when/kt49702.kt");
+            }
+
             @Test
             @TestMetadata("kt9929.kt")
             public void testKt9929() throws Exception {
diff --git a/compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/WhenMissingCase.kt b/compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/WhenMissingCase.kt
index 0f2b2f6e31c..6fd92d9526a 100644
--- a/compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/WhenMissingCase.kt
+++ b/compiler/frontend.common/src/org/jetbrains/kotlin/diagnostics/WhenMissingCase.kt
@@ -45,7 +45,8 @@ sealed class WhenMissingCase {
         }
 
         override fun toString(): String {
-            val name = classId.shortClassName.identifier
+            val className = classId.shortClassName
+            val name = if (className.isSpecial) className.asString() else className.identifier
             return if (isSingleton) name else "is $name"
         }
     }
diff --git a/compiler/testData/diagnostics/tests/when/kt49702.kt b/compiler/testData/diagnostics/tests/when/kt49702.kt
new file mode 100644
index 00000000000..65716474c01
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/when/kt49702.kt
@@ -0,0 +1,9 @@
+// FIR_IDENTICAL
+sealed class A {
+    class B:A()
+    class<!SYNTAX!><!> :A()
+    fun test(a : A) {
+        <!NON_EXHAUSTIVE_WHEN_STATEMENT("sealed class/interface; 'is B', 'is <no name provided>' branches or 'else' branch instead")!>when<!>(a) {
+        }
+    }
+}
\ No newline at end of file
diff --git a/compiler/testData/diagnostics/tests/when/kt49702.txt b/compiler/testData/diagnostics/tests/when/kt49702.txt
new file mode 100644
index 00000000000..e1fa94edbe5
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/when/kt49702.txt
@@ -0,0 +1,25 @@
+package
+
+public sealed class A {
+    protected constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final fun test(/*0*/ a: A): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public final class <no name provided> : A {
+        public constructor <no name provided>()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public final override /*1*/ /*fake_override*/ fun test(/*0*/ a: A): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class B : A {
+        public constructor B()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public final override /*1*/ /*fake_override*/ fun test(/*0*/ a: A): kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
index a3732383278..93300fda835 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
@@ -32651,6 +32651,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/when/kt48653_before.kt");
             }
 
+            @Test
+            @TestMetadata("kt49702.kt")
+            public void testKt49702() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/when/kt49702.kt");
+            }
+
             @Test
             @TestMetadata("kt9929.kt")
             public void testKt9929() throws Exception {