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&mumbles at all levels.

Go for it! Indeed, for the destructuring implementation for NIL I
implemented &mumbles at all levels, and it was easier, cleaner, and
produced considerably less code per DEFMACRO than using the other

For example, the following defmacro:

(defmacro g ((a b (c d)) &optional e)
  (foo a b c d e))

compiles into 42 pdp-10 instructions using the technology presently
provided in Maclisp, but only 7 pdp-10 instructions using the technology used
in NIL (inside the compilation environment in pdp-10 maclisp which *was* used
to compile the cross compiler).