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/usr/lib/s9fes/help/sys_exit is in scheme9 2010.11.13-2.

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S9 EXT  (sys:exit integer)  ==>  undefined
        (sys:exit)          ==>  undefined

Terminate the S9 process and return INTEGER as an exit
code to the calling process. When no explicit exit code
is specified, return zero.

SYS:EXIT never returns any value.

(sys:exit 1)  ==>  undefined