public static SyntaxTree ToggleSingleLineComment(this SyntaxTree syntaxTree, TextSpan textSpan)
{
if (syntaxTree == null)
{
throw new ArgumentNullException(nameof(syntaxTree));
}
var comments = syntaxTree.GetConsecutiveSingleLineComments(textSpan);
return(comments.IsDefaultOrEmpty
? syntaxTree.CommentSingleLineComment(textSpan)
: syntaxTree.UncommentSingleLineComment(comments));
}