private bool IsIgnored(SyntaxNode node)
        {
            if (node.Span.End < _positionOfFirstReducingNullableDirective)
            {
                return(true);
            }

            if (_ignoredSpans is not null)
            {
                if (_ignoredSpans.HasIntervalThatContains(node.SpanStart, node.Span.Length))
                {
                    return(true);
                }
            }

            return(false);
        }