public FailedParseResult(IEnumerable <Token.Type> expectedTokens, Token.Match foundToken, string help)
{
ExpectedTokens = expectedTokens;
FoundToken = foundToken;
Help = help;
Result = default;
}
public FailedParseResult(Token.Type expected, Token.Match found, string help) :
this(new[] { expected }, found, help)
{
}
public static Token.Match Next(this IEnumerator <Token.Match> list, Token.Match def) => !list.MoveNext() ? def : list.Current;