Returns control and multiple values from a lexically enclosing block.
A block form named name must lexically enclose the occurrence of return-from; any values yielded by the evaluation of result are immediately returned from the innermost such lexically enclosing block.
The transfer of control initiated by return-from is performed as described in \secref\TransferOfControl.
(block alpha (return-from alpha) 1)
→(block alpha (return-from alpha 1) 2)
→1
(block alpha (return-from alpha (values 1 2)) 3)
→1 2
(let ((a 0)) (dotimes (i 10) (incf a) (when (oddp i) (return))) a)
→2
(defun temp (x) (when x (return-from temp 'dummy)) 44)
→TEMP
(temp nil)
→44
(temp t)
→DUMMY
(block out (flet ((exit (n) (return-from out n))) (block out (exit 1))) 2)
→1
(block nil (unwind-protect (return-from nil 1) (return-from nil 2)))
→2
(dolist (flag '(nil t)) (block nil (let ((x 5)) (declare (special x)) (unwind-protect (return-from nil) (print x)))) (print 'here))
▷5 HERE 5 HERE
→(dolist (flag '(nil t)) (block nil (let ((x 5)) (declare (special x)) (unwind-protect (when flag (return-from nil)) (print x)))) (print 'here))
▷5 HERE 5 HERE
→
The following has undefined consequences because the block form exits normally before the return-from form is attempted.
(funcall (block nil #'(lambda () (return-from nil))))
✖ERROR: attempt to RETURN-FROM a block that no longer exists.
None.
None.
None.
\issue{EXIT-EXTENT:MINIMAL}