LispEngine.Parsing.Parser.readNext C# (CSharp) Method

        private void readNext()
        {
            try
            {
                next = tokens.MoveNext() ? tokens.Current : null;
            }
            catch (Exception)
            {
                // If an exception is encountered scanning,
                // re-initialize the enumerator (as soon as MoveNext
                // throws an exception the previous enumerator
                // appears to switch to 'EOF').
                // This is to support recovery from typos in the REPL.
                initTokens(s.Recover());
                throw;
            }
        }