@Nullable
    @Deprecated
    public static KotlinType getDeclarationReturnType(KtNamedDeclaration declaration) {
        PsiFile file = declaration.getContainingFile();
        if (!(file instanceof KtFile)) return null;
        DeclarationDescriptor descriptor = ResolutionUtils.unsafeResolveToDescriptor(declaration, BodyResolveMode.FULL);
        if (!(descriptor instanceof CallableDescriptor)) return null;
        KotlinType type = ((CallableDescriptor) descriptor).getReturnType();
        if (type instanceof DeferredType) {
            type = ((DeferredType) type).getDelegate();
        }
        return type;
    }
@Nullable
    @Deprecated
    public static KotlinType getDeclarationReturnType(KtNamedDeclaration declaration)