FIR checker: report type parameters on anonymous objects

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -1486,6 +1486,12 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
+    add(FirErrors.TYPE_PARAMETERS_IN_ANONYMOUS_OBJECT) { firDiagnostic ->
+        TypeParametersInAnonymousObjectImpl(
+            firDiagnostic as FirPsiDiagnostic,
+            token,
+        )
+    }
     add(FirErrors.ILLEGAL_PROJECTION_USAGE) { firDiagnostic ->
         IllegalProjectionUsageImpl(
             firDiagnostic as FirPsiDiagnostic,

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -1057,6 +1057,10 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = TypeParametersInObject::class
     }
 
+    abstract class TypeParametersInAnonymousObject : KtFirDiagnostic<PsiElement>() {
+        override val diagnosticClass get() = TypeParametersInAnonymousObject::class
+    }
+
     abstract class IllegalProjectionUsage : KtFirDiagnostic<PsiElement>() {
         override val diagnosticClass get() = IllegalProjectionUsage::class
     }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -1691,6 +1691,13 @@ internal class TypeParametersInObjectImpl(
     override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
 }
 
+internal class TypeParametersInAnonymousObjectImpl(
+    firDiagnostic: FirPsiDiagnostic,
+    override val token: ValidityToken,
+) : KtFirDiagnostic.TypeParametersInAnonymousObject(), KtAbstractFirDiagnostic<PsiElement> {
+    override val firDiagnostic: FirPsiDiagnostic by weakRef(firDiagnostic)
+}
+
 internal class IllegalProjectionUsageImpl(
     firDiagnostic: FirPsiDiagnostic,
     override val token: ValidityToken,