0.7.7.16:

[sbcl.git] / src / code / late-format.lisp

diff --git a/src/code/late-format.lisp b/src/code/late-format.lisp
index a7d63bd..bc1cfe4 100644 (file)
--- 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))))