methods missing keys of the generic function

[tpapp]

This issue was reported by Péter Salvi via e-mail (thanks Péter!).

Definitions like

(defgeneric test (&key my-key &allow-other-keys) (:method (&key) t))

are not allowed because the method is missing keys that the generic function has. SBCL allows this when &allow-other-keys, but other implementations may not.

Functions that have this problem include MAP1 and AS-ARRAY (need to check others).

Think about element-type and copy?, maybe remove these?