[FE 1.0] Don't use identifier in WhenMissingCase.kt if it wasn't provided

^KT-49702 Fixed

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 {

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 {

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 {

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"
         }
     }

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) {
+        }
+    }
+}

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
+    }
+}

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 {