(when (type/= ctype old-type)
;; FIXME: changing to FTYPE-PROCLAMATION-MISMATCH
;; broke late-proclaim.lisp.
- (style-warn
- "~@<new FTYPE proclamation for ~S~@:_ ~S~@:_~
- does not match the old FTYPE proclamation:~@:_ ~S~@:>"
- name (type-specifier ctype) (type-specifier old-type)))))
-
+ (if (info :function :info name)
+ ;; Allow for tightening of known function types
+ (unless (csubtypep ctype old-type)
+ (cerror "Continue"
+ "~@<new FTYPE proclamation for known function ~S~@:_ ~S~@:_~
+ does not match its old FTYPE:~@:_ ~S~@:>"
+ name (type-specifier ctype) (type-specifier old-type)))
+ (#+sb-xc-host warn
+ #-sb-xc-host style-warn
+ "~@<new FTYPE proclamation for ~S~@:_ ~S~@:_~
+ does not match the old FTYPE proclamation:~@:_ ~S~@:>"
+ name (type-specifier ctype) (type-specifier old-type))))))
;; Now references to this function shouldn't be warned
;; about as undefined, since even if we haven't seen a
;; definition yet, we know one is planned.