/usr/lib/s9fes/help/reverseb is in scheme9 2010.11.13-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | S9fES (reverse! list) ==> list
Reverse LIST in situ, thereby destroying the original list.
Return the reversed list. REVERSE! is much more efficient
than REVERSE, but does not preserve the original list. When
porting S9fES programs, REVERSE! can be replaced by REVERSE.
NOTE: When reversing a list that is bound to a symbol, the
symbol will thereafter be bound to the *last* member of the
list.
(define x '(1 2 3 4 5))
(reverse! x) ==> (5 4 3 2 1)
x ==> (1)
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