static void OutputError <T>(ITriggerMsg e, GenericExpression <T> expr)
{
string error = expr.ErrorMessage;
if (expr.ErrorPosition >= 0)
{
error += " | Postion: " + expr.ErrorPosition;
}
e.Reply(error);
}
// examples: return x; insert y; delete z;
protected internal virtual Parser <string> KeywordExpressionStatement(string keyword) =>
from key in Keyword(keyword).Token()
from expr in GenericExpression.XOptional()
from semicolon in Parse.Char(';')
select expr.GetOrDefault();
