boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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21-letrec-recursion.scm (167B)

      1 ; letrec actually exercises recursion: f(2) recurses to f(#f), which
      2 ; takes the else branch and exits 7.
      3 (sys-exit (letrec ((f (lambda (n) (if n (f #f) 7)))) (f 2)))