ref: 2cf5187ca998708d1b55f13cc9b4c22a5362f8d0
dir: /femtolisp/wt.lsp/
(set! i 0)
(define-macro (while- test . forms)
`((label -loop- (lambda ()
(if ,test
(begin ,@forms
(-loop-))
nil)))))
(while (< i 10000000) (set! i (+ i 1)))