Clarify the "Forgot to expand macro" message

* lisp/emacs-lisp/bytecomp.el (byte-compile-form): Make the
define-after-use warning for macros clearer (bug#43678).

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 966990bac962f319ecf4914b1af8a2d70a9cb56d..7c95c9180095dbf1f3a2620ef7644a67533367bc 100644 (file)
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -3174,7 +3174,8 @@ for symbols generated by the byte compiler itself."
                                   (t "."))))
         (if (eq (car-safe (symbol-function (car form))) 'macro)
             (byte-compile-report-error
-             (format "Forgot to expand macro %s in %S" (car form) form)))
+             (format "`%s' defined after use in %S (missing `require' of a library file?)"
+                     (car form) form)))
         (if (and handler
                  ;; Make sure that function exists.
                  (and (functionp handler)