/// <summary>
/// Normalizes the <paramref name="syntaxTree" /> of the <see cref="Compilation" />.
/// </summary>
/// <param name="syntaxTree">The syntax tree that should be normalized.</param>
protected virtual SyntaxTree Normalize(SyntaxTree syntaxTree)
{
SemanticModel = Compilation.GetSemanticModel(syntaxTree);
_rootNode = syntaxTree.GetRoot();
var normalizedRoot = Visit(_rootNode);
if (_rootNode == normalizedRoot)
return syntaxTree;
return syntaxTree.WithRoot(normalizedRoot);
}