>> (map! + '(1 2 3) '(4 5 6)) => (5 7 9)
>
> You must not! not! not! use map! on constant lists.
Interesting. This is something non-obvious, at least after reading
the Guile documentation. Now, knowing what you've just written, a
second read makes much more sense, and I can see that this is hidden
in the sentence
`map!' is allowed, but not required, to alter the cons cells of
`lst1' ...
Werner
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