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-rw-r--r--module/system/base/message.scm6
1 files changed, 5 insertions, 1 deletions
diff --git a/module/system/base/message.scm b/module/system/base/message.scm
index 75e14ea1e..8cf285afd 100644
--- a/module/system/base/message.scm
+++ b/module/system/base/message.scm
@@ -1,6 +1,6 @@
;;; User interface messages
-;; Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
+;; Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public
@@ -150,6 +150,10 @@
(emit #f "~a to ~a" min max))))
(match rest
+ (('simple-format fmt opt)
+ (emit port
+ "~A: warning: ~S: unsupported format option ~~~A, use (ice-9 format) instead~%"
+ loc (escape-newlines fmt) opt))
(('wrong-format-arg-count fmt min max actual)
(emit port
"~A: warning: ~S: wrong number of `format' arguments: expected ~A, got ~A~%"