From a9ac3be43c8ba2ca83c9409a3e3f4847b2c599c6 Mon Sep 17 00:00:00 2001
From: Robby Findler <robby@racket-lang.org>
Date: Mon, 18 May 2015 20:35:19 -0500
Subject: [PATCH] add missing default value

---
 pkgs/racket-index/setup/xref.rkt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/racket-index/setup/xref.rkt b/pkgs/racket-index/setup/xref.rkt
index 957b017cbf..d2a8fe9f04 100644
--- a/pkgs/racket-index/setup/xref.rkt
+++ b/pkgs/racket-index/setup/xref.rkt
@@ -29,7 +29,7 @@
    (for*/list ([dir (find-relevant-directories (list tag) 'all-available)]
                [d (let ([info-proc (get-info/full dir)])
                     (if info-proc
-                        (info-proc tag)
+                        (info-proc tag (λ () '()))
                         '()))])
      (unless (and (list? d) (pair? d))
        (error 'xref "bad scribblings entry: ~e" d))