make-instance
behaves as specified in ANSI Common Lisp.
In particular it checks the initialization arguments as calculated by compute-class-potential-initargs.
This check can be suppressed by passing
:allow-other-keys t
. In addition, LispWorks provides global control over the initarg checking via set-clos-initarg-checking and per-class control via class-extra-initargs.
In LispWorks 4.2 and previous versions,
make-instance
does not check the initargs. If your code contains invalid initargs, you could use one of the techniques mentioned above to resolve it.
LispWorks User Guide and Reference Manual - 21 Dec 2011