clojure.lang.LineNumberingTextReader.Unread C# (CSharp) Method

        public override void Unread(int ch)
        {
            base.Unread(ch);
            --_index;

            --_columnNumber;

            if (ch == '\n')
            {
                --_lineNumber;
                _columnNumber = _prevColumnNumber;
                _atLineStart = _prevLineStart;
            }
        }