Lars Brinkhoff <lars(a)nocrew.org&gt; writes: > The following interaction: > > (version) > "XEmacs 21.4 (patch 6) \"Common Lisp\" [Lucid] (powerpc-debian-linux, Mule) of Tue Apr 9 2002 on voltaire" > > (byte-compile '(lambda () (let ((%B 42)) (foo)))) > > gives me this backtrace: Thanks for the report; this patch (recommended for both branches) should fix the problem: 2003-12-10 Hrvoje Niksic <hniksic(a)xemacs.org&gt; * bytecomp.el (byte-compile-warn-about-unused-variables): Don't apply `format' to the first argument of byte-compile-warn, it already calls format. --- lisp/bytecomp.el.orig 2003-12-10 09:20:33.000000000 +0100 +++ lisp/bytecomp.el 2003-12-10 09:20:41.000000000 +0100 ＠＠ -1284,7 +1284,7 ＠＠ (setq unreferenced (nreverse unreferenced)) (while unreferenced (byte-compile-warn - (format "variable %s bound but not referenced" (car unreferenced))) + "variable %s bound but not referenced" (car unreferenced)) (setq unreferenced (cdr unreferenced)))))