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I can imagine someone trying to write an editor in portable CL who
would want to use function-parameter-names to provide the user with some
documentation.  The list of symbols would be more valuable than a
describe-function-parameters function, because it allows the editor to
choose a format that fitwhere it has to.  This can be important,
because many editors (i.e. Emacs &friends) devote most of the sceen
to displaying text leaving only  a small area in which messages
have to appear.

ANother use for the symbols themselves is to check for declarations.
A code walker might not have access to the source code for a function,
but it could determine if any of the arguments are special variables
or something.

Chris  Eliot