ref: 6962211e766aa6f4e864d8817beb81ccaa2856d7
dir: /femtolisp/wt.lsp/
(setq i 0)
(defmacro while- (test . forms)
`((label -loop- (lambda ()
(if ,test
(progn ,@forms
(-loop-))
nil)))))
(while (< i 10000000) (setq i (+ i 1)))