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(elisp)Subr Arguments

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Definition of Subr Argument Lists
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   When the advice facility constructs the combined definition, it needs
to know the argument list of the original function.  This is not always
possible for primitive functions.  When advice cannot determine the
argument list, it uses `(&rest ad-subr-args)', which always works but
is inefficient because it constructs a list of the argument values.
You can use `ad-define-subr-args' to declare the proper argument names
for a primitive function:

 - Function: ad-define-subr-args function arglist
     This function specifies that ARGLIST should be used as the
     argument list for function FUNCTION.

   For example,

     (ad-define-subr-args 'fset '(sym newdef))

specifies the argument list for the function `fset'.