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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.33 with-open-stream | Macro
  Syntax: with-open-stream (var stream) {declaration}* {form}* {result}* Arguments and Values: var - a variable name. stream - a form; evaluated to produce a stream. declaration - a declare expression; not evaluated. forms - an implicit progn. results - the values returned by the forms. Description: with-open-stream performs a series of operations on stream, returns a value, and then closes the stream. Var is bound to the value of stream, and then forms are executed as an implicit progn. stream is automatically closed on exit from with-open-stream, no matter whether the exit is normal or abnormal. The stream has dynamic extent; its extent ends when the form is exited. The consequences are undefined if an attempt is made to assign the variable var with the forms. Examples:
       (with-open-stream (s (make-string-input-stream "1 2 3 4"))
          (+ (read s) (read s) (read s)))  6
Side Effects: The stream is closed (upon exit). See Also: close Allegro CL Implementation Details: None.

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