protected static SignatureHelpParameter Convert(
     IParameterSymbol parameter,
     SemanticModel semanticModel,
     int position,
     IDocumentationCommentFormattingService formatter,
     CancellationToken cancellationToken)
 {
     return(new SignatureHelpParameter(
                parameter.Name,
                parameter.IsOptional,
                parameter.GetDocumentationParts(semanticModel, position, formatter, cancellationToken),
                parameter.ToMinimalDisplayParts(semanticModel, position)));
 }