Microsoft.VisualStudio.LanguageServices.Snippets.ISnippetExpansionLanguageHelper.AddImportsAsync(Microsoft.CodeAnalysis.Document, Microsoft.CodeAnalysis.AddImport.AddImportPlacementOptions, Microsoft.CodeAnalysis.Formatting.SyntaxFormattingOptions, System.Int32, System.Xml.Linq.XElement, System.Threading.CancellationToken)