boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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051-shell-signal.scm (350B)

      1 ; Pin the signal-termination branch of decode-wait-status. Run a child
      2 ; that SIGKILLs itself; the prelude's wait should report (#t . (+ 128 9)).
      3 ; Together with 45/56 (exit-code branch) this covers both branches of
      4 ; decode-wait-status without any raw sys-* poking.
      5 (define r (run "/bin/sh" "-c" "kill -9 $$"))
      6 (if (car r) (exit (cdr r)) (exit 99))