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I'm sure I've found times when not having the error-checking has been useful.
For instance, suppose I have a long (or circular) list of triples.
I might want to destructure the first two entries of that list like so.
(DO () (NIL)
(DESTRUCTURING-BIND ((A1 B1 C1) (A2 B2 C2)) LIST ...)
(SETQ LIST (CDDR LIST)))
But you can inhibit the error checking by putting an "&rest ignore" in
there, and then you don't have to make a special non-error checking
version. Isn't this exactly analogous to the discussion we just had
about &whole ?