src/basilisp/lang/reader.py
def pushback(self) -> None:
        """Push one character back onto the stream, allowing it to be
        read again."""
        if abs(self._idx - 1) > self._pushback_depth:
            raise IndexError("Exceeded pushback depth")
        self._idx -= 1
def pushback(self) -> None:
        """Push one character back onto the stream, allowing it to be
        read again."""
        if abs(self._idx - 1) > self._pushback_depth:
            raise IndexError("Exceeded pushback depth")
        self._idx -= 1
Push one character back onto the stream, allowing it to be
        read again.