public bool TryExtractFlag(IEnumerable <string> validFlagNames, out string?flag, out State newState)
{
var result = argumentExtractor.TryExtractFlag(validFlagNames, out flag, out var newArgumentExtractor);
if (result)
{
newState = new State(parameters, newArgumentExtractor, postValidations, assignmentOperators);
}
else
{
newState = this;
}
return(result);
}
