X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Flate-format.lisp;h=bc1cfe4ec7c5c1c35696eea639f1956ebe2d3f5b;hb=4d50265fe5a3dd4ea5b35c8ec12fe2b88721d22c;hp=a7d63bd68f823851937f94451dcaae9f5e5935e8;hpb=77d8ab4720ca70e35d1cf732f17c48bd2ca26e61;p=sbcl.git

diff --git a/src/code/late-format.lisp b/src/code/late-format.lisp
index a7d63bd..bc1cfe4 100644
--- a/src/code/late-format.lisp
+++ b/src/code/late-format.lisp
@@ -225,7 +225,8 @@
        (if expander
 	   (funcall expander directive more-directives)
 	   (error 'format-error
-		  :complaint "unknown directive"))))
+		  :complaint "unknown directive ~@[(character: ~A)~]"
+		  :args (list (char-name (format-directive-character directive)))))))
     (simple-string
      (values `(write-string ,directive stream)
 	     more-directives))))