[CM] S7: empty values list

bil at ccrma.Stanford.EDU bil at ccrma.Stanford.EDU
Sat Jul 31 15:17:29 PDT 2021

(values) in that context returns #<unspecified> for
historical reasons, and to make code more readable;
otherwise we get stuff like (abs -1 (f)).  list-values
is intended for use with quasiquote -- the special
case of () is explained in s7.html.

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