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multiple-value-prog1 (Special Operator)

Syntax:
— Special Form: 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