open-stream-p stream => generalized-boolean
Arguments and Values:
generalized-boolean---a generalized boolean.
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.
(open-stream-p *standard-input*) => true
Side Effects: None.
Should signal an error of type type-error if stream is not a stream.
See Also: None.