public CodeRefactoring GetRefactoring(IDocument document, TextSpan textSpan, CancellationToken cancellationToken)
{
var tree = (SyntaxTree)document.GetSyntaxTree(cancellationToken);
var root = tree.GetRoot(cancellationToken);
var token = tree.GetRoot().FindToken(textSpan.Start);
var m = token.Parent as MethodDeclarationSyntax;
if (m == null) return null;
var model = document.TryGetSemanticModel();
if (model == null) return null;
return new CodeRefactoring(new[] { new ReadyCodeAction(
"Remove method and calls to method (including any side-effects in arguments)",
document,
root,
() => document.NewRootForNukeMethodAndAnySideEffectsInArguments(m))});
}