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| ANSI Common Lisp 5 Data and Control Flow 5.3 Dictionary of Data and Control Flow
5.3.51 multiple-value-prog1 | Special Operator
  Syntax: multiple-value-prog1 first-form {form}* first-form-results Arguments and Values: first-form - a form; evaluated as described below. form - a form; evaluated as described below. first-form-results - the values resulting from the evaluation of first-form. Description: multiple-value-prog1 evaluates first-form and saves all the values produced by that form. It then evaluates each form from left to right, discarding their values. Examples:
       (setq temp '(1 2 3))  (1 2 3)
       (multiple-value-prog1
          (values-list temp)
          (setq temp nil)
          (values-list temp))  1, 2, 3
See Also: prog1 Allegro CL Implementation Details: None.

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