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@(do
(defmacro while ((condition : result) . body)
(let ((cblk (gensym "cnt-blk-"))
(bblk (gensym "brk-blk-")))
'(macrolet ((break (value) '(return-from ,',bblk ,value)))
(symacrolet ((break (return-from ,bblk))
(continue (return-from ,cblk)))
(block ,bblk
(for () (,condition ,result) ()
(block ,cblk ,*body)))))))
(let ((i 0))
(while ((< i 100))
(if (< (inc i) 20)
continue)
(if (> i 30)
break)
(prinl i)))
(prinl
(sys:expand
'(while ((< i 100))
(if (< (inc i) 20)
continue)
(if (> i 30)
break)
(prinl i)))))
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