private async Task<Document> CrunchPropertyAsync(SyntaxNode oldRoot, Document document, PropertyDeclarationSyntax property, CancellationToken cancellationToken)
{
var syntaxTree = await document.GetSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
var semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
// Get the property's backing field.
var backingField = property.GetBackingField(semanticModel);
// Call the Property Cruncher. The code refactoring happens here.
var collapser = new PropertyCruncher(semanticModel, backingField, property);
var newRoot = collapser.Visit(oldRoot);
// Update code with the refactored Root
return document.WithSyntaxRoot(newRoot);
}