/// <summary> if the current input starts with the given string, succeed and consumes all the characters until the end of line '\n character.
/// It does not consume the end of line character.
/// </summary>
/// <param name="start">the start string.
/// </param>
/// <returns> the scanner.
/// </returns>
public static Scanner IsLineComment(string start)
{
return(IsPattern("line comment", Patterns.IsLineComment(start), start));
}