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Syntax:
make-broadcast-stream &rest streams => broadcast-stream
Arguments and Values:
broadcast-stream---a broadcast stream.
Description:
Returns a broadcast stream.
Examples:
 (setq a-stream (make-string-output-stream)
        b-stream (make-string-output-stream)) =>  #<String Output Stream>
 (format (make-broadcast-stream a-stream b-stream)
          "this will go to both streams") =>  NIL
 (get-output-stream-string a-stream) =>  "this will go to both streams"
 (get-output-stream-string b-stream) =>  "this will go to both streams"
 
Side Effects: None.
Affected By: None.
Exceptional Situations:
Should signal an error of type type-error if any stream is not an output stream.
See Also:
Notes: None.
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