Undoes the last call to stream-read-char .
stream-read-char
stream
stream-unread-char stream character => nil
A stream.
character
A character.
nil
The generic function stream-unread-char undoes the last call to stream-read-char , as in unread-char . Every subclass of fundamental-character-input-stream must define a method for this function.
stream-unread-char
unread-char
fundamental-character-input-stream