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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.11 open-stream-p | Function
  Syntax: open-stream-p stream generalized-boolean Arguments and Values: stream - a stream. generalized-boolean - a generalized boolean. Description: Returns true if stream is an open stream; otherwise, returns false. Streams are open until they have been explicitly closed with close, or until they are implicitly closed due to exit from a with-output-to-string, with-open-file, with-input-from-string, or with-open-stream form. Examples:
       (open-stream-p *standard-input*)  true
Affected By: close. Exceptional Situations: Should signal an error of type type-error if stream is not a stream. Allegro CL Implementation Details: None.

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