-;;; COMPILER-NOTE is vaguely like COMPILER-ERROR and the other
-;;; condition-signalling functions, but it just writes some output
-;;; instead of signalling. (In CMU CL, it did signal a condition, but
-;;; this didn't seem to work all that well; it was weird to have
-;;; COMPILE-FILE return with WARNINGS-P set when the only problem was
-;;; that the compiler couldn't figure out how to compile something as
-;;; efficiently as it liked.)
-(defun compiler-note (format-string &rest format-args)
+;;; The act of signalling one of these beasts must not cause WARNINGSP
+;;; (or FAILUREP) to be set from COMPILE or COMPILE-FILE, so we can't
+;;; inherit from WARNING or STYLE-WARNING.
+;;;
+;;; FIXME: the handling of compiler-notes could be unified with
+;;; warnings and style-warnings (see the various handler functions
+;;; below).
+(define-condition compiler-note (condition) ())
+(define-condition simple-compiler-note (simple-condition compiler-note) ())
+
+(defun compiler-notify (format-string &rest format-args)
+ ;; FORMAT-STRING and FORMAT-ARGS might well end up turning into
+ ;; DATUM and REST, and COERCE-TO-CONDITION will be used.