val incompatibilityType: ExpectActualAnnotationsIncompatibilityType<FirAnnotation>
    }

    interface OptionalDeclarationOutsideOfAnnotationEntry : KtFirDiagnostic<PsiElement> {
        override val diagnosticClass get() = OptionalDeclarationOutsideOfAnnotationEntry::class
    }

    interface OptionalDeclarationUsageInNonCommonSource : KtFirDiagnostic<PsiElement> {

internal class OptionalDeclarationOutsideOfAnnotationEntryImpl(
    firDiagnostic: KtPsiDiagnostic,
    token: KtLifetimeToken,
) : KtAbstractFirDiagnostic<PsiElement>(firDiagnostic, token), KtFirDiagnostic.OptionalDeclarationOutsideOfAnnotationEntry

internal class OptionalDeclarationUsageInNonCommonSourceImpl(
    firDiagnostic: KtPsiDiagnostic,

            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.OPTIONAL_DECLARATION_OUTSIDE_OF_ANNOTATION_ENTRY) { firDiagnostic ->
        OptionalDeclarationOutsideOfAnnotationEntryImpl(
            firDiagnostic as KtPsiDiagnostic,
            token,
        )
    }
    add(FirErrors.OPTIONAL_DECLARATION_USAGE_IN_NON_COMMON_SOURCE) { firDiagnostic ->