protected override ImmutableArray <Diagnostic> AnalyzeSemanticModel(SemanticModelAnalysisContext context, SimpleIntervalTree <TextSpan, TextSpanIntervalIntrospector>?codeBlockIntervalTree)
{
var semanticModel = context.SemanticModel;
var cancellationToken = context.CancellationToken;
var options = context.GetCSharpAnalyzerOptions().GetSimplifierOptions();
var root = semanticModel.SyntaxTree.GetRoot(cancellationToken);
var simplifier = new TypeSyntaxSimplifierWalker(this, semanticModel, options, ignoredSpans: codeBlockIntervalTree, cancellationToken);
simplifier.Visit(root);
return(simplifier.Diagnostics);
}