code: function __err2code(program, err) {
              if (typeof err.stack !== 'string')
                  return indent(program, 4);
              var match = /<anonymous>:(\d+):(\d+)\)/.exec(err.stack);
              if (!match) {
                  return indent(program, 4);
              }
              var line = parseInt(match[1], 10)-1,
                  start = line - 3,
                  end = line + 4,
                  lines = program.split("\n");
              if (start < 0) start = 0;
              if (end > lines.length) end = lines.length;
              var code = [];
              start = 0; end = lines.length;
              while (start < end) {
                  code.push(start === line ? "--> "+lines[start] : "    "+lines[start]);
                  start++;
              }
              return indent(code.join('\n'), 4);
          }
docs: Generates a code view of eval'ed code from an Error.
  @param {string} program Failed program
  @param {!Error} err Error caught
  @returns {string} Code view
  @inner
  @private