From 12055fe0aa4c2f4a8f62017bc13d1c94e47f2bd0 Mon Sep 17 00:00:00 2001
From: "Guillermo J. Rozas" <edu/mit/csail/zurich/gjr>
Date: Sun, 22 Nov 1992 23:37:05 +0000
Subject: [PATCH] Test availability before exporting names.

---
 v7/src/edwin/rename.scm | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/v7/src/edwin/rename.scm b/v7/src/edwin/rename.scm
index 11b7395dc..ef060c502 100644
--- a/v7/src/edwin/rename.scm
+++ b/v7/src/edwin/rename.scm
@@ -1,8 +1,8 @@
 ;;; -*-Scheme-*-
 ;;;
-;;;	$Id: rename.scm,v 1.5 1992/09/10 02:44:22 cph Exp $
+;;;	$Id: rename.scm,v 1.6 1992/11/22 23:37:05 gjr Exp $
 ;;;
-;;;	Copyright (c) 1989-92 Massachusetts Institute of Technology
+;;;	Copyright (c) 1989-1992 Massachusetts Institute of Technology
 ;;;
 ;;;	This material was developed by the Scheme project at the
 ;;;	Massachusetts Institute of Technology, Department of
@@ -51,11 +51,13 @@
       (window (->environment '(edwin window))))
   (let ((g<-e
 	 (lambda (g e)
-	   (local-assignment global g (lexical-reference edwin e)))))
+	   (if (not (lexical-unreferenceable? edwin e))
+	       (local-assignment global g (lexical-reference edwin e))))))
     (g<-e 'save-editor-files 'debug-save-files))
   (let ((e<-w
 	 (lambda (e w)
-	   (lexical-assignment edwin e (lexical-reference window w)))))
+	   (if (not (lexical-unreferenceable? window w))
+	       (lexical-assignment edwin e (lexical-reference window w))))))
     (e<-w 'window? 'buffer-frame?)
     (e<-w 'window-x-size 'buffer-frame-x-size)
     (e<-w 'window-y-size 'buffer-frame-y-size)
-- 
2.25.1