X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fbackq.lisp;h=b82b4641ac874eeede936189c0ba93d6ce34cebd;hb=56a972e201d117a8d5d769527f2bafd23cba7de9;hp=839314158f046f9a354d57eebc39d9dc886c21de;hpb=ac0bb62cb48dcba68b07e0a1eb5573de92373c7c;p=sbcl.git

diff --git a/src/code/backq.lisp b/src/code/backq.lisp
index 8393141..b82b464 100644
--- a/src/code/backq.lisp
+++ b/src/code/backq.lisp
@@ -249,4 +249,12 @@
   '(backq-comma backq-comma-at backq-comma-dot backq-list
     backq-list* backq-append backq-nconc backq-cons backq-vector))
 
+;;; Since our backquote is installed on the host lisp, and since
+;;; developers make mistakes with backquotes and commas too, let's
+;;; ensure that we can report errors rather than get an undefined
+;;; function condition on %READER-ERROR.
+#+sb-xc-host ; proper definition happens for the target
+(defun %reader-error (stream format-string &rest format-args)
+  (bug "READER-ERROR on stream ~S: ~?" stream format-string format-args))
+
 (/show0 "done with backq.lisp")