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ANSI Common Lisp 3 Evaluation and Compilation 3.4 Lambda Lists 3.4.1 Ordinary Lambda Lists
3.4.1.3 A specifier for a rest parameter
&rest, if present, must be followed by a single rest parameter
specifier, which in turn must be followed by another
lambda list keyword or the end of the lambda list. After all
optional parameter specifiers have been processed, then there may or
may not be a rest parameter. If there is a rest parameter, it is
bound to a list of all as-yet-unprocessed arguments. If
no unprocessed arguments remain, the rest parameter is bound to the
empty list. If there is no rest parameter and there are no
keyword parameters, then an error
should be signaled if
any unprocessed arguments remain; see Section 3.5 Error Checking in Function Calls.
The value of a rest parameter
is permitted, but not required, to share structure with the
last argument to apply.
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