- (when (info :function :info name)
- ;; This is an error because it's generally a bad thing to blow
- ;; away all the old optimization stuff. It's also a potential
- ;; source of sneaky bugs:
- ;; DEFKNOWN FOO
- ;; DEFTRANSFORM FOO
- ;; DEFKNOWN FOO ; possibly hidden inside some macroexpansion
- ;; ; Now the DEFTRANSFORM doesn't exist in the target Lisp.
- ;; However, it's continuable because it might be useful to do
- ;; it when testing new optimization stuff interactively.
- #+nil (cerror "Go ahead, overwrite it."
- "overwriting old FUNCTION-INFO for ~S" name)
- (warn "overwriting old FUNCTION-INFO for ~S" name))
+ (let ((old-function-info (info :function :info name)))
+ (when old-function-info
+ ;; This is handled as an error because it's generally a bad
+ ;; thing to blow away all the old optimization stuff. It's
+ ;; also a potential source of sneaky bugs:
+ ;; DEFKNOWN FOO
+ ;; DEFTRANSFORM FOO
+ ;; DEFKNOWN FOO ; possibly hidden inside some macroexpansion
+ ;; ; Now the DEFTRANSFORM doesn't exist in the target Lisp.
+ ;; However, it's continuable because it might be useful to do
+ ;; it when testing new optimization stuff interactively.
+ (cerror "Go ahead, overwrite it."
+ "~@<overwriting old FUNCTION-INFO ~2I~_~S ~I~_for ~S~:>"
+ old-function-info name)))