private async Task <Document> ImplementVirtualRaiseEventFieldAsync(Document document, EventFieldDeclarationSyntax declaration, CancellationToken c)
{
var eventName = declaration.Declaration.Variables.Single().Identifier.ValueText;
var raiseMethod = CreateRaiseMethod(eventName, eventName,
(declaration.Declaration.Type as GenericNameSyntax));
var root = await document.GetSyntaxRootAsync(c);
var newRoot = root.InsertNodesAfter(declaration, new SyntaxNode[] { raiseMethod });
// Note that we need to find the node again
declaration = newRoot.FindToken(declaration.Span.Start).Parent.AncestorsAndSelf()
.OfType <EventFieldDeclarationSyntax>().First();
var modifiers = declaration.Modifiers;
var virtualToken = modifiers.Single(m => m.Kind() == SyntaxKind.VirtualKeyword);
var newDeclaration = declaration.ReplaceToken(virtualToken, Token(SyntaxKind.None));
newRoot = newRoot.ReplaceNode(declaration, newDeclaration
.WithTrailingTrivia(TriviaList(CarriageReturnLineFeed, CarriageReturnLineFeed)));
return(document.WithSyntaxRoot(newRoot));
}